Are we Underutilizing Mobil 1 10W30?

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I recently had a conversation with a New Mexico member of one of the Ford Focus forums. He has a 2005 base model Ford Focus with just under 340,000 miles on it. Automatic transmission. Looks like it has been through war, but still runs very strong. The engine and everything else are original. If I had to guess, I would say 98% of Focus on the road today have fewer miles than this.

When I asked what were his motor oil and oil change intervals, I was floored by his responses. He said: "I use ONLY regular Mobil 1 10W30. (The 5W30 only in winter). Oil change intervals were typically 20,000 miles. The shortest were 15,000 miles. He is currently working on a 30,000 mile interval. This car, and my Trailblazer, does not seem to care about a 20,000 mile interval with this oil."

When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money. Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30. The same Focus engines outside the USA all run on 30 wt oil, not 20 wt. If you do use, Mobil 1 0W20 or 5W20, keep a close eye on oil consumption. I have minimal consumption with Mobil 1 10W30."

Also, to top all that, when I asked what automatic transmission change intervals he used to reach 340,000 miles? He response: "I am still on my original automatic transmission fluid. I just never thought about it. However at this point, I am a bit afraid of what would happen if I do so, at this point." The owners manual calls for 30,000 mile change intervals.

I know many of you are going to say, " I use Mobil 1 0W20 at 10,000 mile intervals & I have 100,00+ miles." To that, I say, that if good for you, but that is nothing to "write home about" today. What impresses me, is a guy who has over 340,000 miles on 20,000 mile intervals, on a vehicle that typically doesn't make it that far. That says more to me, than a UOA or even an engine teardown. Almost makes me rethink my 0W20 oil purchase. I have a 2004 Focus with 2.3L Duratec engine with 90,000 miles. Also have a 2010 Ford Fusion Hybrid with 115,000 miles.

So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?
 
If he really wanted to buy the "proven" M1, he would buy 5w-20 because that was the first grade introduced.

He obviously drives a lot so it may work for him. People who live in or commute to cities shouldn't follow him, IMO.
 
10K OCI's on M1 5W-40 TDT in my Jag. UOA results are stellar. Oil remains clean, even after all those miles.

I also found that the 10W-30 works wonderfully in my F150's. Also helps reduce cam phaser knock when compared to the "required" 5W-20. I also get about 1/2 the wear metals on the 10W-30.

Like your friend, I've achieved over 300,000 miles on standard M1, 10W-30. Interestingly, the engine's internal condition, compression and oil consumption were all perfect, even after all those miles.
 
And how does he KNOW the composition of the two oils is "the same". Others say the same thing about car batteries, for example.
 
Originally Posted By: Best F100
When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money.

I assume that he has some scientific and quantifiable evidence to back up that statement and not just his opinion/assumption?

Originally Posted By: Best F100
Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30.

Blah, blah, blah, blah, blah. Funny how there many other Ford vehicles--namely taxis and police vehicles running 5W-20 that have more mileage than his car and some or most of them are not even using a synthetic oil.

Originally Posted By: Best F100
So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?

I have already done a 15K run on M1 AFE and have M1 EP in the sump now that I intend to run out to 20K. 15K Results are here --->All 2010_FX4 UOAs To Date. One thing to note is how much oil is having to add between OCs? Adding oil replenishes the add pack allowing it to go further--hence the 20K-30K runs. Based upon my runs of it, I could not go 30K on a run of regular M1 without adding some (perhaps 0.75 quarts or so), but I have a 7 quart sump.
 
100 miles a day of no traffic highway travel is almost best case scenario for oil. Throw in fresh additives from topping up and 20K miles is doable but the engine will be varnished to the max.

Transmission is the same story, steady highway cruising = almost no wear on the clutches or the fluid.
 
"The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money. "

Ethics aside, I seriously doubt that this would pass muster in XOM's legal department.
 
How does he know it'll go 20-30k miles and "everything's fine"? Does he just assume things are fine since the engine still runs? I wouldn't go that far without UOAs backing it up, and at 20k I'd probably use a 5w30 or 10w30 too cause it'll likely shear in that long of a run
 
Originally Posted By: 2010_FX4
Originally Posted By: Best F100
When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money.

I assume that he has some scientific and quantifiable evidence to back up that statement and not just his opinion/assumption?

Originally Posted By: Best F100
Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30.

Blah, blah, blah, blah, blah. Funny how there many other Ford vehicles--namely taxis and police vehicles running 5W-20 that have more mileage than his car and some or most of them are not even using a synthetic oil.

Originally Posted By: Best F100
So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?

I have already done a 15K run on M1 AFE and have M1 EP in the sump now that I intend to run out to 20K. 15K Results are here --->All 2010_FX4 UOAs To Date. One thing to note is how much oil is having to add between OCs? Adding oil replenishes the add pack allowing it to go further--hence the 20K-30K runs. Based upon my runs of it, I could not go 30K on a run of regular M1 without adding some (perhaps 0.75 quarts or so), but I have a 7 quart sump.






FX4:
I think you are being a bit to hard on this poor guy's responses. Obviously, you know he can't PROVE that regular Mobil 1 & Extended Performance Mobil 1 are the same. Or could you PROVE otherwise. I applaud your 15,000 mile interval. You both use your best judgement as to how far you can drive, without facing dire consequences. For that matter, none of us could prove why Pennzoil Yellow Bottle or Pennzoil Ultra would up with such ridiculously low NOACK results. We speculated that some extra GLT base was thrown in. Ain't speculation great?

That guy went on to tell me that he picked Mobil 1 10W30 in 2005, because it was a Group IV based motor oil & that is "as good as it gets. He said he had not researched it since then." I could have argued that it is a Group III/IV/V mixture, but what would be the point? He is the one with close to 350,000 miles. So he has bragging rights - and can talk. Will you make it there?

You entirely missed the point. You have a F150 that is SUPPOSED to go 300,000+ miles. It's built Ford Tough, right? I see F150's all the time, with more mileage than this. Job 1, OK? Crown Vic Taxis with slow turning, big V8 engines are SUPPOSED to go over 300,000 miles on almost any kind of oil put in them. So give the guy some credit, that he is going in uncharted areas with a vehicle that is typically disposed of, before seeing anywhere near 300,000 miles, using 10W30, not 5W20.
 
Originally Posted By: HKPolice
100 miles a day of no traffic highway travel is almost best case scenario for oil. Throw in fresh additives from topping up and 20K miles is doable but the engine will be varnished to the max.

Transmission is the same story, steady highway cruising = almost no wear on the clutches or the fluid.


Agree 100%. And do I like Mobil 1? Yeah I do, but it's all about driving conditions. I probably chnage my oil too soon - 5,000 mile intervals - so I may extend out further to 10,000 miles, but I'm not going 20k just because some guy with a ford focus does it without problems. It's about how you drive.
 
Originally Posted By: Best F100
Originally Posted By: 2010_FX4
Originally Posted By: Best F100
When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money.

I assume that he has some scientific and quantifiable evidence to back up that statement and not just his opinion/assumption?

Originally Posted By: Best F100
Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30.

Blah, blah, blah, blah, blah. Funny how there many other Ford vehicles--namely taxis and police vehicles running 5W-20 that have more mileage than his car and some or most of them are not even using a synthetic oil.

Originally Posted By: Best F100
So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?

I have already done a 15K run on M1 AFE and have M1 EP in the sump now that I intend to run out to 20K. 15K Results are here --->All 2010_FX4 UOAs To Date. One thing to note is how much oil is having to add between OCs? Adding oil replenishes the add pack allowing it to go further--hence the 20K-30K runs. Based upon my runs of it, I could not go 30K on a run of regular M1 without adding some (perhaps 0.75 quarts or so), but I have a 7 quart sump.






FX4:
I think you are being a bit to hard on this poor guy's responses. Obviously, you know he can't PROVE that regular Mobil 1 & Extended Performance Mobil 1 are the same. Or could you PROVE otherwise. I applaud your 15,000 mile interval. You both use your best judgement as to how far you can drive, without facing dire consequences. For that matter, none of us could prove why Pennzoil Yellow Bottle or Pennzoil Ultra would up with such ridiculously low NOACK results. We speculated that some extra GLT base was thrown in. Ain't speculation great?

That guy went on to tell me that he picked Mobil 1 10W30 in 2005, because it was a Group IV based motor oil & that is "as good as it gets. He said he had not researched it since then." I could have argued that it is a Group III/IV/V mixture, but what would be the point? He is the one with close to 350,000 miles. So he has bragging rights - and can talk. Will you make it there?

You entirely missed the point. You have a F150 that is SUPPOSED to go 300,000+ miles. It's built Ford Tough, right? I see F150's all the time, with more mileage than this. Job 1, OK? Crown Vic Taxis with slow turning, big V8 engines are SUPPOSED to go over 300,000 miles on almost any kind of oil put in them. So give the guy some credit, that he is going in uncharted areas with a vehicle that is typically disposed of, before seeing anywhere near 300,000 miles, using 10W30, not 5W20.


So a focus wasnt designed to go over 300,000 miles but the crown vics were? I dont get your logic. He drives minimum 35000 miles a year (assuming he bought car in 2004) which indicates changes twice per year (you said he uses 5w30 in winter). So what that says is he likely does tons of highway driving which as others have said is easy on everything. EP and reg M1 are not the exact same. On his next car get him to run 0w20 M1 with same intervals and id bet itd last just as long. Just because the engine still runs means nothing. Not everyone will want to keep their cars to 350,000 miles anyways..and if they did it would likely be of something other than engine related. Also, how much top up oil does he add during the OCI? There are too many variables in order to make a blanket statement.
 
Last edited:
Originally Posted By: 2010_FX4
Originally Posted By: Best F100
When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money.

I assume that he has some scientific and quantifiable evidence to back up that statement and not just his opinion/assumption?

Originally Posted By: Best F100
Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30.

Blah, blah, blah, blah, blah. Funny how there many other Ford vehicles--namely taxis and police vehicles running 5W-20 that have more mileage than his car and some or most of them are not even using a synthetic oil.

Originally Posted By: Best F100
So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?

I have already done a 15K run on M1 AFE and have M1 EP in the sump now that I intend to run out to 20K. 15K Results are here --->All 2010_FX4 UOAs To Date. One thing to note is how much oil is having to add between OCs? Adding oil replenishes the add pack allowing it to go further--hence the 20K-30K runs. Based upon my runs of it, I could not go 30K on a run of regular M1 without adding some (perhaps 0.75 quarts or so), but I have a 7 quart sump.


That's an impressive tbn after 15,000 miles.
 
I
Originally Posted By: Best F100
I recently had a conversation with a New Mexico member of one of the Ford Focus forums. He has a 2005 base model Ford Focus with just under 340,000 miles on it. Automatic transmission. Looks like it has been through war, but still runs very strong. The engine and everything else are original. If I had to guess, I would say 98% of Focus on the road today have fewer miles than this.

When I asked what were his motor oil and oil change intervals, I was floored by his responses. He said: "I use ONLY regular Mobil 1 10W30. (The 5W30 only in winter). Oil change intervals were typically 20,000 miles. The shortest were 15,000 miles. He is currently working on a 30,000 mile interval. This car, and my Trailblazer, does not seem to care about a 20,000 mile interval with this oil."

When I mentioned to him, that AutoZone recently had Mobil 1 0W20 Extended Performance at a clearance price ($15 for a 5qt jug - I bought 3), he replied: " The Extended Performance version is identical as the regular version - you are just paying extra for the guarantee - so save your money. Also, both 0W20 and 5W20 are offered for government emissions, and fractional fuel economy gains purposes. For engine longevity, buy the proven, Mobil 1 10W30. The same Focus engines outside the USA all run on 30 wt oil, not 20 wt. If you do use, Mobil 1 0W20 or 5W20, keep a close eye on oil consumption. I have minimal consumption with Mobil 1 10W30."



Also, to top all that, when I asked what automatic transmission change intervals he used to reach 340,000 miles? He response: "I am still on my original automatic transmission fluid. I just never thought about it. However at this point, I am a bit afraid of what would happen if I do so, at this point." The owners manual calls for 30,000 mile change intervals.

I know many of you are going to say, " I use Mobil 1 0W20 at 10,000 mile intervals & I have 100,00+ miles." To that, I say, that if good for you, but that is nothing to "write home about" today. What impresses me, is a guy who has over 340,000 miles on 20,000 mile intervals, on a vehicle that typically doesn't make it that far. That says more to me, than a UOA or even an engine teardown. Almost makes me rethink my 0W20 oil purchase. I have a 2004 Focus with 2.3L Duratec engine with 90,000 miles. Also have a 2010 Ford Fusion Hybrid with 115,000 miles.

So, do we have any takers? Who will be the first to go 20,000 miles on a Mobil 1 product. I some do it in Europe, but who will go that far on US roads?


At least for Mobil1 0w-20, this assertion is dead wrong. The EP version is 60-70% PAO, the regular version 30-40%. For an extra $2.00 per 5 quarts this seems a good value to me.
 
My 1994 LS400 with 370+k miles had OCI's as follow: 6mo with dino 12mo with synthetic. Oil filter was changed once a year(reuse with dino). It had various name brands 5W30 dino and syn, no works in the engine and it has original valve cover gasket and valve cover never remove for anything.
 
My son and I put 354K on a Ford Ranger using M1 10-30 at 10-14K OCIs. The engine never increased in oil use, and ran and sounded as good as when new. The valve covers were never removed. A friend has a 2000 Taurus Duratech with 350K all on M1 5-30 at 10K OCIs and still runs great. Here at BITOG"Fsskier" had a Ford Escort and used M1 0-20AFE and put 300K o n it and the engine still ran great doing 20K OCIs. I am new using 0-20 AFE(3-4 years),but so far no oil use in 10K OCIs.
 
Last edited:
Originally Posted By: Best F100
FX4:
I think you are being a bit to hard on this poor guy's responses. Obviously, you know he can't PROVE that regular Mobil 1 & Extended Performance Mobil 1 are the same. Or could you PROVE otherwise. I applaud your 15,000 mile interval. You both use your best judgment as to how far you can drive, without facing dire consequences. For that matter, none of us could prove why Pennzoil Yellow Bottle or Pennzoil Ultra would up with such ridiculously low NOACK results. We speculated that some extra GLT base was thrown in. Ain't speculation great?

That guy went on to tell me that he picked Mobil 1 10W30 in 2005, because it was a Group IV based motor oil & that is "as good as it gets. He said he had not researched it since then." I could have argued that it is a Group III/IV/V mixture, but what would be the point? He is the one with close to 350,000 miles. So he has bragging rights - and can talk. Will you make it there?

You entirely missed the point. You have a F150 that is SUPPOSED to go 300,000+ miles. It's built Ford Tough, right? I see F150's all the time, with more mileage than this. Job 1, OK? Crown Vic Taxis with slow turning, big V8 engines are SUPPOSED to go over 300,000 miles on almost any kind of oil put in them. So give the guy some credit, that he is going in uncharted areas with a vehicle that is typically disposed of, before seeing anywhere near 300,000 miles, using 10W30, not 5W20.


You are the messenger so you have to read this via proxy. I like seeing vehicles make it above 300K, it lends credence to the fact that we are finally getting our money out of modern vehicles. Do I think his “recipe” is a sound one? Not in the slightest.

I am too hard on the guy? Well, welcome to BITOG and Reality Check 101 and allow me to remove the sugar coating:

1. While he may not be able to prove that M1 and M1EP are not the same, it is quite easy to do via UOAs, VOAs, and MSDS. The chemical composition is not the same and you can see it for yourself—he should take a moment to read about it and educate himself. However, I take it based upon his certainty that he is beyond using facts to form decisions.

2. He is using “arm chair engineering” to make decisions on how far to drive without facing dire consequences whereas I have statistical data to make mine—hardly the same. I did not blindly increase to a 15K OCI and will not do it to a 20K OCI either. Unless he has some data to share, he is using opinion, gut feel, and seat of the pants intuition to make his.

3. We will have to see if I make it to 350K, but I have no doubt that I will based upon the trending that I have to date. There is simply too much evidence to the contrary in the fleets today to believe otherwise.

4. I did not miss the point in the slightest. The point was that he inferred that he has made it to 350K because he is using 10W-30. I say that he could have made there on 5W-20 just as Ford specified--I will take Ford engineering over his opinion any day of the week and his “results”. These “facts” that xW-20 is only as good as the CAFE regulation that it was built around is complete and utter rubbish. After more than a decade of xW-20 in widespread use we should be able to put that to rest.

5. His Focus was also built with Job1 and is Ford Tough just as my FX4 is—so your statement does not scan logically. However, the difference is that I actually trust that Ford knows what they are talking about when they specify something and do not arm chair engineer something that I contrive to be a better solution. Ford spends millions of dollars and hours testing and certifying their products—they do not lightly specify a grade of oil unless they know it will work.

6. His is not in uncharted territory in the slightest. There are far too many similar cars like Hondas and Toyotas as well as the Ford which are specified for and are using xW-20 as the oil that have more miles than his does. A strawman argument? Perhaps, but facts are facts no matter and there is plenty of anecdotal evidence to back up what I am saying.

7. I believe that it is a matter of blind luck that he has accomplished what he has thus far. I question how much make-up oil that he is using to replenish the TBN such that it remains viable. I will bet you a steak dinner that he is not doing a 30K OCI with no make-up oil.

8. Last, but not least, the main problem that I have with people like New Mexico is they spew their bovine scatology laced screeds as fact and gospel and some uninformed person reads it and proceeds to follow it and ruins an engine. Far better it would be for him to place a disclaimer upon his posts to initiate the uniformed that he is stating an opinion—but rarely if ever do those persons do that for it would deflate the overall perception they have.
 
Obviously thinner oil helps with cold temperature start ups as we've read here countless times, here in FLORIDA I would even run 20w50 in my vehicles without worry.
 
Originally Posted By: 2010_FX4
Originally Posted By: Best F100
FX4:
I think you are being a bit to hard on this poor guy's responses. Obviously, you know he can't PROVE that regular Mobil 1 & Extended Performance Mobil 1 are the same. Or could you PROVE otherwise. I applaud your 15,000 mile interval. You both use your best judgment as to how far you can drive, without facing dire consequences. For that matter, none of us could prove why Pennzoil Yellow Bottle or Pennzoil Ultra would up with such ridiculously low NOACK results. We speculated that some extra GLT base was thrown in. Ain't speculation great?

That guy went on to tell me that he picked Mobil 1 10W30 in 2005, because it was a Group IV based motor oil & that is "as good as it gets. He said he had not researched it since then." I could have argued that it is a Group III/IV/V mixture, but what would be the point? He is the one with close to 350,000 miles. So he has bragging rights - and can talk. Will you make it there?

You entirely missed the point. You have a F150 that is SUPPOSED to go 300,000+ miles. It's built Ford Tough, right? I see F150's all the time, with more mileage than this. Job 1, OK? Crown Vic Taxis with slow turning, big V8 engines are SUPPOSED to go over 300,000 miles on almost any kind of oil put in them. So give the guy some credit, that he is going in uncharted areas with a vehicle that is typically disposed of, before seeing anywhere near 300,000 miles, using 10W30, not 5W20.


You are the messenger so you have to read this via proxy. I like seeing vehicles make it above 300K, it lends credence to the fact that we are finally getting our money out of modern vehicles. Do I think his “recipe” is a sound one? Not in the slightest.

I am too hard on the guy? Well, welcome to BITOG and Reality Check 101 and allow me to remove the sugar coating:

1. While he may not be able to prove that M1 and M1EP are not the same, it is quite easy to do via UOAs, VOAs, and MSDS. The chemical composition is not the same and you can see it for yourself—he should take a moment to read about it and educate himself. However, I take it based upon his certainty that he is beyond using facts to form decisions.

2. He is using “arm chair engineering” to make decisions on how far to drive without facing dire consequences whereas I have statistical data to make mine—hardly the same. I did not blindly increase to a 15K OCI and will not do it to a 20K OCI either. Unless he has some data to share, he is using opinion, gut feel, and seat of the pants intuition to make his.

3. We will have to see if I make it to 350K, but I have no doubt that I will based upon the trending that I have to date. There is simply too much evidence to the contrary in the fleets today to believe otherwise.

4. I did not miss the point in the slightest. The point was that he inferred that he has made it to 350K because he is using 10W-30. I say that he could have made there on 5W-20 just as Ford specified--I will take Ford engineering over his opinion any day of the week and his “results”. These “facts” that xW-20 is only as good as the CAFE regulation that it was built around is complete and utter rubbish. After more than a decade of xW-20 in widespread use we should be able to put that to rest.

5. His Focus was also built with Job1 and is Ford Tough just as my FX4 is—so your statement does not scan logically. However, the difference is that I actually trust that Ford knows what they are talking about when they specify something and do not arm chair engineer something that I contrive to be a better solution. Ford spends millions of dollars and hours testing and certifying their products—they do not lightly specify a grade of oil unless they know it will work.

6. His is not in uncharted territory in the slightest. There are far too many similar cars like Hondas and Toyotas as well as the Ford which are specified for and are using xW-20 as the oil that have more miles than his does. A strawman argument? Perhaps, but facts are facts no matter and there is plenty of anecdotal evidence to back up what I am saying.

7. I believe that it is a matter of blind luck that he has accomplished what he has thus far. I question how much make-up oil that he is using to replenish the TBN such that it remains viable. I will bet you a steak dinner that he is not doing a 30K OCI with no make-up oil.

8. Last, but not least, the main problem that I have with people like New Mexico is they spew their bovine scatology laced screeds as fact and gospel and some uninformed person reads it and proceeds to follow it and ruins an engine. Far better it would be for him to place a disclaimer upon his posts to initiate the uniformed that he is stating an opinion—but rarely if ever do those persons do that for it would deflate the overall perception they have.







Wow. No need to come across as pompous here - unless you are an ExxonMobil engineer with something new to tell the rest of us something we don't already know. For someone who "likes seeing vehicles go over 300,000 miles" it sure doesn't sound like it - if it wasn't done your way. Even a professional bass fisherman on the pro bass tour, would take notice and have more respect when amateurs on occasions out fish them. Believe it or not, it happens. The obvious question to ask, is how did you get to 300,000 miles, not scoff at his methods of "blind luck". For full disclosure, please tell the rest of us Bitogers what vehicles you have taken over 300,000 miles - and how you did it. ....................................................................... Crickets. Well I'm pulling for you anyway. Just be glad, I don't live next to you. You sure would have a lot explaining or excuses if you have to replace an engine at, say, 180,000 miles. Would the scientific data say it's Ford's enginers fault, Mobil 1's fault, or the man in the mirrors fault. Theory and UOA's don't always equal reality. So you better not get rid of that truck until you crack 300,000 miles! And in my mind, breaking 600,000 miles in a big V8 truck would be about the equivalent to 350,000 miles on a 4 cylinder, 4 speed transmission vehicle from that same manufacturer.

By the way, if you think it is not uncharted territory for older Focus to reach 350,000 on the same engine & transmission, you are forgetting a few things. A) You forget the role of accountants, who have more say on a Focus, than they would a Taurus, Crown Vic or F150. These vehicles are built closer to a price point, than a F150. (How many Focus commercials have you seen "at work" vs an F150). It would not surprise me find out that both Honda & Toyota employs a greater percentage of engineers vs accountants. (So if anyone knows, chime in). From my observations, I don't see many Mazdas get over 300,000 miles, but that is another story. B) And even if it was built to a price point, it is going to take more attention to maintenance (and less abuse) to get reach 350,000.

Like I said before, 98% of the Focus of that era on the factory recommended 5W20 don't reach 350,000 miles. So for someone to do so, on something else, should count for more than "blind luck." My personal opinion is Mobil 1 10W30 may not be the optimum viscosity nationwide, but it sure did not hurt this owner, in a New Mexico climate. In closing, when you think of all those 1950's vehicles in Cuba still running. What oil viscosity would you think they have?
 
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