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What weight of oil 20 or 30? Rrrrrrr

Posted By: chubbie

What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:06 AM

Hi everyone a few weeks ago I bought a new to me 2007 dodge ram 1500 with the 3.7L v6. I changed the oil i used qsad 5w-30. However on the oil cap it showed 5w-20. In my owners manual yes says 5w-20.But some of the auto part stores say I should use the 5w-30 Which was recommended by Oreilly auto. checked at pennzoil .com and valvoline.com they say 5w-30. I googled this found an old thread on here years ago molar was wrong misprint in the owners manual 30 weight should be used.I'm confused.So what weight am I supposed to use? Yes here in the desert it's 100 so I'm not sure but 30 weight could be ok for the summer? I hope someone has some info on this and set me straight.
Posted By: Gasbuggy

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 08:28 AM

I drove one of these trucks for a week. Please use the 5w30. That engine works hard to move the truck around and it has no moving parts that must have 20wt (like the MDS equipped hemis).
Posted By: demarpaint

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 08:44 AM

I run 5W30 in my 08 3.7L Liberty, that's what I'd use in your Ram.
Posted By: Kamele0N

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 09:14 AM

10w-15w.....40....HDEO... that is what I would use in a desert....
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 09:36 AM

This ๐Ÿ‘‡ [Linked Image]
Posted By: zrxkawboy

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 09:42 AM

Iโ€™d definitely use xW30.
Posted By: AZjeff

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 10:43 AM

Originally Posted by Mad_Hatter
[Linked Image]



Nice chart but it's in C. shrug
Posted By: skyactiv

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 11:23 AM

Originally Posted by AZjeff
Originally Posted by Mad_Hatter
[Linked Image]



Nice chart but it's in C. shrug


95% of the world population uses Celsius.
Posted By: AZjeff

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 11:52 AM

And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.
Posted By: Chris142

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:10 PM

Shows that a multi VI's 10/15w40 is good to 104F.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:34 PM

Originally Posted by AZjeff
Originally Posted by Mad_Hatter
[Linked Image]



Nice chart but it's in C. shrug


And that's a problem how exactly? Never a shortage of critics on this board!๐Ÿ˜‚
Posted By: supton

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:37 PM

Originally Posted by AZjeff
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.

If you're online you can easily convert the units using google.

Otherwise just remember the formula on how to convert. If you can remember that you have to either add or subtract 32, and that's multiplying by either 5/9's or 9/5's, you can easily work it out. Since we're Fahrenheit people, start in the F domain. To make 32 into 0, you'd have to subtract 32. And to make 212 into 100, you'd subtract that 32, then since 180 is still much larger than 100, it has to be multiplying by 5/9's. Reverse the order to go from C to F: multiple by 9/5's and then add 32. Done. Simple math.

Would be nice if we had kept to the plan and changed in 1975, suffered through the pain in the 80's, and had been done with it, but oh well.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:38 PM

Originally Posted by AZjeff
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.


No, YOU do F ..I have no problem going between Fahrenheit and Centigrade๐ŸŒก๏ธ๐Ÿ˜‰

Try this one...0 is freezing โ„๏ธ, 40 is freaking hot๐Ÿ”ฅ. Now you can do my chart...๐Ÿ˜‰
Posted By: dippschtick

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:40 PM

https://www.rapidtables.com/convert/temperature/celsius-to-fahrenheit-chart.html
Posted By: faltic

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 12:54 PM

So where would 0W20 place on this chart?
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 01:00 PM

Originally Posted by faltic
So where would 0W20 place on this chart?


That was interesting...I had to go through a few charts to find one that had 0w20. Anyhow... hope this helps. (it's in Centigrade, hope that's not an issue ๐Ÿ˜‰)

[Linked Image]
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 01:13 PM

Being new here, I'm sure this has been posted before but this is another cool/good chart... [Linked Image]
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 01:35 PM

Originally Posted by Chris142
Shows that a multi VI's 10/15w40 is good to 104F.


I think my manual for middle east region starts at that... which you can still get Mobil 1 Advanced at that grade for under $25.
Posted By: tig1

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 01:40 PM

If Chrysler is so stupid to call for 5-20, then why would you buy a Ram truck to start with?
Posted By: Nick1994

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 01:40 PM

Originally Posted by Mad_Hatter
This ๐Ÿ‘‡ [Linked Image]

That is a ridiculous chart that is not relevant whatsoever.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 02:50 PM

Originally Posted by Nick1994
Originally Posted by Mad_Hatter
This ๐Ÿ‘‡ [Linked Image]

That is a ridiculous chart that is not relevant whatsoever.


Really? Do you not know what is? Or maybe you should call Noria (they specialize in lubricants) from whom I lifted the chart from and convey your thoughts.. See link below.๐Ÿ‘‡

https://www.machinerylubrication.com/Read/30197/choose-engine-oil

Or Amsoil's website if you prefer.. similar chart will help even YOU select the proper oil. ๐Ÿ˜‰

https://blog.amsoil.com/a-beginners-guide-to-motor-oil/
Posted By: BlueOvalFitter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:04 PM

I was born in the USA and we have never had to use the Celcius temperature chart. We were taught to use the Ferinheight chart. I must be one of those in the .1 percentile that didn't learn Celcius. shrug
Posted By: kschachn

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:24 PM

Originally Posted by BlueOvalFitter
I was born in the USA and we have never had to use the Celcius temperature chart. We were taught to use the Ferinheight chart. I must be one of those in the .1 percentile that didn't learn Celcius.

Never heard of Celcius nor Ferinheight temperatures, must be a thing down south.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:32 PM

Originally Posted by kschachn
Originally Posted by BlueOvalFitter
I was born in the USA and we have never had to use the Celcius temperature chart. We were taught to use the Ferinheight chart. I must be one of those in the .1 percentile that didn't learn Celcius.

Never heard of Celcius nor Ferinheight temperatures, must be a thing down south.



Maybe it's because there's just one temp in the south, muggy?๐Ÿค”๐Ÿ˜‚
Posted By: BlueOvalFitter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:42 PM

Originally Posted by Mad_Hatter
Originally Posted by kschachn
Originally Posted by BlueOvalFitter
I was born in the USA and we have never had to use the Celcius temperature chart. We were taught to use the Ferinheight chart. I must be one of those in the .1 percentile that didn't learn Celcius.

Never heard of Celcius nor Ferinheight temperatures, must be a thing down south.



Maybe it's because there's just one temp in the south, muggy?๐Ÿค”๐Ÿ˜‚

Yeah, the humidity down here clouds the brain. grin
I must have a fan club. Almost every reply I make on this site, there is that same member, following me.
banana grin
Posted By: aquariuscsm

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:54 PM

I would go with 10W30.
Posted By: Jimmy_Russells

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 03:56 PM

Originally Posted by Mad_Hatter
Originally Posted by faltic
So where would 0W20 place on this chart?


That was interesting...I had to go through a few charts to find one that had 0w20. Anyhow... hope this helps. (it's in Centigrade, hope that's not an issue ๐Ÿ˜‰)

[Linked Image]



0W20 good to 10ยฐC only. LOL! Who believes this stuff?
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 04:06 PM

Originally Posted by Jimmy_Russells
Originally Posted by Mad_Hatter
Originally Posted by faltic
So where would 0W20 place on this chart?


That was interesting...I had to go through a few charts to find one that had 0w20. Anyhow... hope this helps. (it's in Centigrade, hope that's not an issue ๐Ÿ˜‰)

[Linked Image]



0W20 good to 10ยฐC only. LOL! Who believes this stuff?


Who believes this stuff?...the Society of Automotive Engineers, that's who. I believe the higher the outside temps, the less efficient heat exchange is in the engine/cooling system and this effects an oils ability to resist thinning??

Maybe someone with more background can explain it better but there's a reason why they run a thicker 15w50 in the middle East and not a 0w20.

Posted By: oldhp

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 04:15 PM

5W30.....Sleep well. Peace out my friends........it's just a chart.
Posted By: kschachn

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 04:18 PM

No, that chart is weird. I see you deleted the first response you made about the oil having an assigned viscosity and beginning to thin out at 10C, which obviously isn't correct. Oil viscosity for an assigned grade is not measured at 10C.

But what does it mean? Am I not supposed to use those grades at ambient temperatures above the upper limit of the bar? That does not make sense.
Posted By: 2012AccentSE

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 04:28 PM

Chart is irrelevant. I only speak 'Murican. Git out with that Celcius junk!

lol

OP, 5w30 or 5w20 is fine. Don't over think it like 99.9% of people on here.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 04:53 PM

Originally Posted by kschachn
No, that chart is weird. I see you deleted the first response you made about the oil having an assigned viscosity and beginning to thin out at 10C, which obviously isn't correct. Oil viscosity for an assigned grade is not measured at 10C.

But what does it mean? Am I not supposed to use those grades at ambient temperatures above the upper limit of the bar? That does not make sense.


I did delete it because it wasn't accurate. I am not fully clear how/why the SAE oil grade chart uses ambient temperatures. My guess is, that it effects heat exchange in some form??? I know the ambient operating temps is relevant, otherwise my owners manual wouldn't tell me to use the grade of oil for my climate and reference the same SAE oil chart (other words, it's also in my manual).

I don't know any more than that. Maybe shoot an email off to Amsoil or Royal Purple and see if you can get a better explanation from one of their engineers. [Linked Image]
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 05:12 PM

I've found numerous past discussions on this topic. While I've yet to read a clear explanation of the SAE values, most seem to agree use the ambient operating temp chart listed in your manual. In my case my manual references the SAE scale/chart, so I'm still confused/unclear. I'm thinking that the oil doesn't blow up if used beyond the ambient temperature listed but maybe it's ability to resist thinning and maintain it's original grade, is somehow compromised the higher the ambient temp gets???


https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3239805/Oil_Viscosity/Ambient_Temperat
Posted By: Jimmy_Russells

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 05:34 PM

Originally Posted by Mad_Hatter
Originally Posted by Jimmy_Russells
Originally Posted by Mad_Hatter
Originally Posted by faltic
So where would 0W20 place on this chart?


That was interesting...I had to go through a few charts to find one that had 0w20. Anyhow... hope this helps. (it's in Centigrade, hope that's not an issue ๐Ÿ˜‰)

[Linked Image]



0W20 good to 10ยฐC only. LOL! Who believes this stuff?


Who believes this stuff?...the Society of Automotive Engineers, that's who. I believe the higher the outside temps, the less efficient heat exchange is in the engine/cooling system and this effects an oils ability to resist thinning??

Maybe someone with more background can explain it better but there's a reason why they run a thicker 15w50 in the middle East and not a 0w20.




Uhh, yeah.

What I know is a large amount of manufacturers have spec'd 20 weight oil for temperatures far higher than 10 degrees, without issues, for decades.
Posted By: kschachn

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:10 PM

Nothing quite a goofy as some of those charts. We had a discussion about them a while back, and it seems like in some cases they are never updated properly. Even that owner's manual example you gave it says this:
Quote
...however, higher viscosity engine oils are required for satisfactory lubrication in hot weather. Using oils of any viscosity other than those recommended could result in engine damage.

But then the chart shows that all grades are recommended for the highest temperature shown in the chart. It implies you can't use anything not on the chart (Using oils of any viscosity other than those recommended could result in engine damage) but it says higher viscosity oils are "required" in hot weather.
Posted By: Propflux01

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:12 PM

Originally Posted by supton
Originally Posted by AZjeff
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.

If you're online you can easily convert the units using google.

Otherwise just remember the formula on how to convert. If you can remember that you have to either add or subtract 32, and that's multiplying by either 5/9's or 9/5's, you can easily work it out. Since we're Fahrenheit people, start in the F domain. To make 32 into 0, you'd have to subtract 32. And to make 212 into 100, you'd subtract that 32, then since 180 is still much larger than 100, it has to be multiplying by 5/9's. Reverse the order to go from C to F: multiple by 9/5's and then add 32. Done. Simple math.

Would be nice if we had kept to the plan and changed in 1975, suffered through the pain in the 80's, and had been done with it, but oh well.


For those like me, who donโ€™t have the math gene, an easy ballpark way is to just double the C, and add 30. So 12C would round out to 12 +12=24, then 24+30= 54* for going back down, subtract 30 from current F temp, then 1/2 that result. works pretty good for poor mans math.
Posted By: JLTD

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:30 PM

Originally Posted by chubbie
Hi everyone a few weeks ago I bought a new to me 2007 dodge ram 1500 with the 3.7L v6. I changed the oil i used qsad 5w-30. However on the oil cap it showed 5w-20. In my owners manual yes says 5w-20.But some of the auto part stores say I should use the 5w-30 Which was recommended by Oreilly auto. checked at pennzoil .com and valvoline.com they say 5w-30. I googled this found an old thread on here years ago molar was wrong misprint in the owners manual 30 weight should be used.I'm confused.So what weight am I supposed to use? Yes here in the desert it's 100 so I'm not sure but 30 weight could be ok for the summer? I hope someone has some info on this and set me straight.


The 3.7 was originally specified for 5w-30. I used it in my '04 Dodge Ram and currently use it in the wife's '08 Liberty. Back spec occurred some time later. Since you're in AZ, I'd think you could even use a 10w-30 year 'round.



Originally Posted by AZjeff
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.


Just a different way of looking at it, is all. IMO the US should have followed through the changeover that started in the 70s....we are overdue in joining everyone else in the world*.

To go C to F, double it, take off 10% and add 32. So 35ยฐC = 70-7+32 = 95ยฐF.


Originally Posted by Propflux01


For those like me, who donโ€™t have the math gene, an easy ballpark way is to just double the C, and add 30. So 12C would round out to 12 +12=24, then 24+30= 54* for going back down, subtract 30 from current F temp, then 1/2 that result. works pretty good for poor mans math.


thumbsup That's the quick and dirty way...pretty good but gets progressively inaccurate the further you move away from center.....



*(well, everyone except for a couple Caribbean countries and Sierra Leone Correction: SL went metric in 2011. It's Burma and Liberia. Also Great Britain, which uses metric, except for distance which is still miles - since they invented miles I guess)

https://www.vox.com/2015/2/16/8031177/america-fahrenheit

Posted By: supton

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:31 PM

Originally Posted by Propflux01
Originally Posted by supton
Originally Posted by AZjeff
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.

If you're online you can easily convert the units using google.

Otherwise just remember the formula on how to convert. If you can remember that you have to either add or subtract 32, and that's multiplying by either 5/9's or 9/5's, you can easily work it out. Since we're Fahrenheit people, start in the F domain. To make 32 into 0, you'd have to subtract 32. And to make 212 into 100, you'd subtract that 32, then since 180 is still much larger than 100, it has to be multiplying by 5/9's. Reverse the order to go from C to F: multiple by 9/5's and then add 32. Done. Simple math.

Would be nice if we had kept to the plan and changed in 1975, suffered through the pain in the 80's, and had been done with it, but oh well.


For those like me, who donโ€™t have the math gene, an easy ballpark way is to just double the C, and add 30. So 12C would round out to 12 +12=24, then 24+30= 54* for going back down, subtract 30 from current F temp, then 1/2 that result. works pretty good for poor mans math.

I suspect I'll forget that trick, but thumbsup all the same. Close enough!
Posted By: Jimmy_Russells

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:31 PM

[Linked Image]
Posted By: JLTD

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:43 PM

Originally Posted by Jimmy_Russells
[Linked Image]


Great chart!
Posted By: PimTac

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:44 PM

Could we refrain from using the R word here. Itโ€™s offensive. A grown adult does not need to use that word.
Posted By: JLTD

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:47 PM

Originally Posted by PimTac
Could we refrain from using the R word here. Itโ€™s offensive. A grown adult does not need to use that word.


Which one? Reserve? Ready? Reality? LOL
Posted By: gfh77665

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:48 PM

Originally Posted by Mad_Hatter

Try this one...0 is freezing โ„๏ธ, 40 is freaking hot๐Ÿ”ฅ. Now you can do my chart...๐Ÿ˜‰


Years ago I learned:

"30 is hot, 20 is nice, 10 is cold, 0 is ice".
Posted By: badduxx

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:56 PM

Quote
Try this one...0 is freezing โ„๏ธ, 40 is freaking hot๐Ÿ”ฅ. Now you can do my chart...๐Ÿ˜‰


This is probably the most helpful thing I have learned on this forum in months!
Posted By: Skippy722

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 06:57 PM

[quote=Jimmy_Russells][Linked Image]

I REFUSE to say or write โ€œ24/06/2019 or โ€œ24 June 2019.โ€
Posted By: supton

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 07:24 PM

Years ago I started writing date in YYYY-MM-DD. Seems to make the most sense for filing, be it files or folders on the computer, or papers in real life. Very simple, work from MSB to LSB.

I still marvel over the fact that while measuring distance and volume can be metric, time isn't. The second may be the base unit in metric but it's still 60 minutes to the hour, 24 to the day, 364 to the year. 7 days to a week and 30-ish days to the month. And then it gets beat up during leap years and other times of adjustment. Even metric users have to put up non-base 10 math when it comes to time. Yet the most common complaint about non-metric from metric users is... how do you remember all the different numbers if they aren't all related by factors of 10? but they manage to figure out the time of day and day of the year all the same.
Posted By: Jimmy_Russells

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 07:48 PM

Originally Posted by PimTac
Could we refrain from using the R word here. Itโ€™s offensive. A grown adult does not need to use that word.


It's part of the chart man, I didn't put it there

The worst thing is tire sizes. Imperial, metric, and percentages all in one!

Posted By: Silverado12

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 08:01 PM

24June19 is how we did it in the service. My first day was 03July78.
Posted By: Mad_Hatter

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 08:06 PM

Originally Posted by gfh77665
Originally Posted by Mad_Hatter

Try this one...0 is freezing โ„๏ธ, 40 is freaking hot๐Ÿ”ฅ. Now you can do my chart...๐Ÿ˜‰


Years ago I learned:

"30 is hot, 20 is nice, 10 is cold, 0 is ice".


I like that, catchy..๐Ÿ‘
Posted By: ka9mnx

Re: What weight of oil 20 or 30? Rrrrrrr - 06/24/19 09:44 PM

Originally Posted by Silverado12
24June19 is how we did it in the service. My first day was 03July78.

Yep. That's the way we did it in the military and it stuck with me.
Posted By: chubbie

Re: What weight of oil 20 or 30? Rrrrrrr - 06/25/19 05:00 AM

Ok wow! A lot to read and follow on here now. So I guess the rams or the 3.7L was back specd to 5w-30 so either 20 or 30 weights would be ok.at least to me I does make sense to use the 30 weight with the heat. good.now this ocd loop in my mind can shut off.What is mds?
Posted By: gfh77665

Re: What weight of oil 20 or 30? Rrrrrrr - 06/25/19 03:23 PM

Originally Posted by chubbie
. So I guess the rams or the 3.7L was back specd to 5w-30 so either 20 or 30 weights would be ok.at least to me I does make sense to use the 30 weight with the heat. good.


Yes, use the 30wt in the summer. The 20wt's are spec just for CAFE purposes, not engine protection.
Posted By: WyrTwister

Re: What weight of oil 20 or 30? Rrrrrrr - 06/25/19 04:12 PM

When I was in chemestry & physice class , we used both metric & imperial / English systems all the time .
Posted By: PimTac

Re: What weight of oil 20 or 30? Rrrrrrr - 06/25/19 04:26 PM

Originally Posted by WyrTwister
When I was in chemestry & physice class , we used both metric & imperial / English systems all the time .




Actually it was pretty easy as long as you had your Pee Chee.
Posted By: DGXR

Re: What weight of oil 20 or 30? Rrrrrrr - 06/25/19 06:10 PM

I suggest 5w30, not only because of the various recommendations, but also because the vehicle is 12+ years old and probably has some wear. Also, most manufacturers recommending Xw20 oils do this for fuel economy/CAFE reasons and because it provides adequate engine protection, not because it's the best engine protection.
Posted By: chubbie

Re: What weight of oil 20 or 30? Rrrrrrr - 06/26/19 02:57 AM

I see makes sense also in the owners manual it says do engine oil changes at 5k miles never to exceed 6k miles. I'm assuming that is for conventional motor oil.it doesn't say anything about synthetic. Also I would change earlier if I was towing.about how long roughly could i go with synthetic without towing?
Posted By: ChrisD46

Re: What weight of oil 20 or 30? Rrrrrrr - 06/26/19 12:25 PM

Ambient temp in a well running engine / cooling system probably means less to a grade of oil versus the proper protection the engine needs ... 5W20 may provide adequate engine protection however 5W30 may provide ideal engine protection .
Posted By: JLTD

Re: What weight of oil 20 or 30? Rrrrrrr - 07/03/19 11:46 AM

Originally Posted by chubbie
I see makes sense also in the owners manual it says do engine oil changes at 5k miles never to exceed 6k miles. I'm assuming that is for conventional motor oil.it doesn't say anything about synthetic. Also I would change earlier if I was towing.about how long roughly could i go with synthetic without towing?


The owners manual is a conservative estimate which is supposed to cover any oilโ€ฆ With UOAs you could easily extend your intervals, depending on your oil.

With the right synthetic, I would think that 10,000 mile intervals would be easily and safely done. Possibly more depending on your driving habits.
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