How many do 10K OCIs

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Originally Posted By: Mystic
And I still remember seeing photographs of what an engine looked like (I think it was a VW vehicle) after the owner had done 15,000 mile oil changes with conventional motor oil. Those were some nasty photographs.

Some car owners need to either grow a brain or stop driving (I am referring to the owner of the disaster you saw in photographs). I think you would be hard pressed to find anyone on this site who would recommend going to a 15K OCI with any type of oil without confirming the health of the oil along the way. In most cases changing the oil and filter at 10K would still be draining oil and pulling a filter that still had some life left. We are each free to do our own thing when it comes to car maintenance and have no obligation to explain anything to anyone. However, there is more than enough data to substantiate the fact that in a normal engine (not a sludger) there is little if any difference in engine health, cleanliness, or longevity between a 3K, 5K, or 7.5K OCI with conventional oils likewise a 5K, 7.5K, and 10K OCI with synthetics. Those days are long past...
 
Originally Posted By: Mystic
Oil is cheap compared to a new engine. I would never go over 6000 miles with a synthetic oil. 6000 miles or six months would take me halfway through the year. And oil changes every 6 months/6000 miles would probably keep the engine cleaner.

I never changed dino oil at less than 6,000 miles in my LS400, with synthetic oil the OCI is 12-15k/12mo, some OCI's was up to 17-18k in 1 year. It's 20 years old with more than 350k miles. The engine is running well, it consumes about 1/2 quart in 3-4k miles since new.

Do I care if the engine doesn't look like new ? If it is vanish but no sludge then what ?
 
I think what the problem is, most everybody posting in this thread are not mechanics and
have never had to disassemble an engine; because if they were, then they'd understand.
 
Originally Posted By: Merkava_4
I think what the problem is, most everybody posting in this thread are not mechanics

That's actually a good thing. Some of the biggest misconceptions that I've heard came from car mechanics, including synthetic will make your engine leak, and don't buy pennzoil because it'll turn to wax. Most of them are really out of touch and behind times when it comes to modern motor oil.
 
Its true. I'm a diesel mechanic for a living and sometimes i'm shocked at how little the older mechanics here know about oil, or most of the other fluids in a truck for that matter. One in particular thinks that because Mobil 1 said their EP oil can go up to 15000 miles, he's ok running it that long in his car. He lives 5 mins from work,b so the car never gets warmed up. I told him you don't know how long you can really run it with out getting it tested. I've given up trying to educate them, they then procede to look at me and talk to me like i'm the one that doesn't know what i'm talking about.
 
Blows their mind to when we get a Penske Hino in the shop and their service stickers say they go 20,000 miles between oil changes. Hinos 6cyls. Have a factory recommended oci of 6000 miles. I've seen some of Penskes oil analysis reports, and what they are doing works perfectly fine. Probably saves they're fleets a lot of money in the long run.
 
Originally Posted By: Mystic
I just don't understand the desire to take a motor oil to near exhaustion. Now it depends on how a person drives and weather conditions, dust in the environment, etc. So every car is unique. And there are differences between motor oils.

But even today motor oil is not that expensive. I know guys who can spend enough money in one trip to a night club to pay for an oil change. Two less trips to the night clubs and they can do two oil changes a year.

And I still remember seeing photographs of what an engine looked like (I think it was a VW vehicle) after the owner had done 15,000 mile oil changes with conventional motor oil. Those were some nasty photographs. I have seen a used car where the car looked good and when I checked out the dipstick the oil looked like black tar. I walked away from a good looking car in a used car lot when I saw that. The used car dealer had not even changed the oil and it looked like whoever had owned the car had rarely if ever changed the oil.

Sure a person wants to get their money worth out of the oil and oil filter. I would prefer to drain the oil when it still has some life left. And I would prefer to change the oil filter before it gets plugged up.

I remember a while back at this website it seemed like some guys were in a competition to see who could go the greatest time and distance on one oil change. That is not for me.


I don't think it's really a matter of money but about making the time to change the oil or getting it changed. Most people are not fanatical about changing oil much less what kind of oil they use. Most people I know are pretty busy in their daily lives and since changing oil is not a priority, they let the miles rack up before they know it.

My fiancée is like that. She never thinks twice about when to change the oil and if I didn't keep track, she would be one of those people who went 15,000 miles before she got it changed. Especially since we have a 60 mile a day round trip drive to work. Miles pile on pretty quick.

Wayne
 
Extensive data should be hard to overlook. For years the world said the earth was flat. Kendall Motor oil was the 1st to come out with 2K motor oil. Years later Quaker state advertised conventional motor oil that exceeded the universal 3K interval. Car manufacturers have increased their oil service recommendations. Clearly there is a trend which shows engine metallurgy and oil quality has made it possible to run oil much longer. Members here have proven that conventional motor oil is capable of being extended beyond what was the commonly acceptable interval. Its called progress and you're still going to have people who resist that changes made to autos occurred.
Reports that show wear occurs during more in the first 1500 miles than the back end of an OCI have not quieted the naysayers from increasing the frequency oil is changed or others who swear by filter changes when oil is changed when clearly that may not be the case as well as more frequent air filter changes.
They say you can't teach an old dog new tricks, and thats why new dogs are born every season.
 
Originally Posted By: Quattro Pete
Originally Posted By: Merkava_4
I think what the problem is, most everybody posting in this thread are not mechanics

That's actually a good thing. Some of the biggest misconceptions that I've heard came from car mechanics, including synthetic will make your engine leak, and don't buy pennzoil because it'll turn to wax. Most of them are really out of touch and behind times when it comes to modern motor oil.



There's a local shop I trust for almost anything. They do great work and don't try to wring out every bit of money from the customer. They rely on word of mouth and have the best reputation in the area. They also recommend 3000 mile oil changes as the way to get the best longevity out of an engine. Even today with 10K mile oil changes recommended by the major manufacturers or oil change monitors. I've never had my oil changed there. I always preferred to have it done myself.
 
Originally Posted By: y_p_w
They also recommend 3000 mile oil changes

Yes, this is very convenient for them as it drums up more business. The more often you come back to their shop, the more often they have a chance to upsell you on some additional services, too.
 
For both grand Marquis. I do 1 yr changes with M1, usually that's 6500-9000 miles...

My old truck has 3K on dino since last Dec, not planning on a change before next spring...
 
I have reported on my long distance oil change experience many times previously.....sorry, here it goes again.

1994 Lumina APV severe use tow vehicle, towing 5,000 lbs 4 days a week. Also served as a short distance commuter vehicle. Rated to tow 3500 lbs with the larger motor....I had the 3.1 litre rated to tow 2,000 lbs.

1994 Escort, 1.9 litre, 5 speed manual, wifes commuter car, 70 miles daily.

Both were treated to Mobil 1 0W20 almost there entire life (5W30 the first year) and 20,000 mile oil change intervals. Both arrived at or near the 300,000 mile mark in 2008, with engines that seemed like new to me....did not burn, leak or drip oil and were free of abnormal noises. I never had them apart....I did have the valve cover off the Escort when the cover gasket SUDDENLY shot out sideways and failed. This was likely around 200,000 miles, and the engine looked very clean inside.

We are now using a 2007 Corolla and a 2008 Sienna...and they are getting 10K mile oil changes. Both are nearing 100,000 miles now and are also seemingly perfect. 0W20 oil of course!! The Sienna has assumed all towing duties, and is a great great tow vehicle!

I am always surprised at the number of people who think using their cars normally is "severe service".

Incidentally, the engines I have run 0W20 in are by far the longest lasting engines I have ever had......much longer than anything I ever put 10W40 into!

Now, when it comes to winter snow ski vacations and bitter cold weather......ok, thats another whole chapter, but 0W20 wins hands down!
 
Originally Posted By: TFB1
For both grand Marquis. I do 1 yr changes with M1, usually that's 6500-9000 miles...

My old truck has 3K on dino since last Dec, not planning on a change before next spring...


I also do 1 year oil changes. I used to change oil twice a year,not anymore. We do change oil in the Crown Vic around 5-6000 miles.
 
Originally Posted By: wtd
Mystic said:
I just don't understand the desire to take a motor oil to near exhaustion.


Agreed. One more misconception to build on that comment is oil doesn't suddenly change from bad to good.

So my pet peeve is people who
1) Drive the oil to exhaustion, spending the time and effort to get it tested to find that exhaustion point

but then

2) spend hours during the OC to obsessively drip drain out every drop of the old oil, because the oil is bad.

Oil doesn't suddenly switch from being good to bad; If they are going through this huge effort to get out every drop because it's "bad" oil that is harming their engine; well they were just driving on a full sump full of that same bad oil just the day earlier.
If this was damaging oil, it should have been changed far sooner before it reached the state that it is in.
Click to expand...
 
Last edited:
Originally Posted By: afoulk
Its true. I'm a diesel mechanic for a living and sometimes i'm shocked at how little the older mechanics here know about oil, or most of the other fluids in a truck for that matter. One in particular thinks that because Mobil 1 said their EP oil can go up to 15000 miles, he's ok running it that long in his car. He lives 5 mins from work,b so the car never gets warmed up. I told him you don't know how long you can really run it with out getting it tested. I've given up trying to educate them, they then procede to look at me and talk to me like i'm the one that doesn't know what i'm talking about.


It's not going to get better soon. Some of those old mechanics become apprenticeship teachers. I could not believe some of the stuff that my son's College teacher told them about oil. Some of it was so far off all one would have to do is look in their text book to see that he was wrong. From people who run more than 5000km OCIs and follow OLMs being crazy to misconceptions about XwXX ratings. It was kinda scary actually.
 
Funny you mention older mechanics and such CP3. Two relatives of mine sad to say have this mindset that "if you use 10w40 or 20w50, your engine will have less wear no matter what engine/vehicle". I walked away from both of them after this, and dont talk to them much for this reason therefore. Old habits I guess.
 
Im planning to do 15000 mile oci and extending it to 20 000mile after doing a few UOA.
Just took some pics with engine covers removed and will use that as my reference point. If all are ok , 15 000 miles will be my oci.
 
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