Running pup 20 weight you're practically running a 30 weight. Usually tests in the 9.5 range at 100c.
Should I trust Jeep engineers on 0W-20?
- Thread starter Jeep Junkie
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Take a look at your owners manual. My wife's Mazda CX-5 says to use 0W-20 but if you look in the owners manual that applies to the US and Canada only. Everywhere else says to use 5W-30. The US requirement for 0W-20 is a fuel economy thing for EPA standards.
I run 5W-30 year round.
I run 5W-30 year round.
Yeah, my wifes 2024 CX-5 and my 2023 Mazda 3 (same engines) say "Recommend" 0W-20, but 0W-20 REQUIRED for fuel economy rating. Which makes sense. They aren't saying you can't use a 30 weight, they're saying you have to use a 20 weight for fuel economy.
Everywhere else in the world it's 5W-30. This is actully pretty telling as that means 5W-30 is better for the engine longevity and Mazda knows it. IN the USA it's clearly a sacrifice of economy vs longevity/protection. I will say though, I have never seen where strictly using a 20 weight oil caused an engine to fail after X amount of miles. IN theory, a 30 weight will protect better, but not sure it really matters in the average amount of time most people keep a vehicle. 200K, 300K, etc.
LIke @kschachn said above, this topic has been beat to death!
How does off roading spec a different oil? This answer should be interesting!
I was very surprised that in the track oriented cars like Project 8, Jaguar spec'd 0W20.
I'd love to see the UOAs after track usage.
I'm sure 0W-20 will be fine. That said, I had leftover 5W-30 from my wife's late Equinox that I put in the Ram at the last oil change. Result? Got 28 MPG on a recent road trip out to Arizona, which is pretty typical when I'm not towing. Years ago I tried keeping track of mileage on my CR-V for a year on 5W-20, then for a year on 5W-30. Results were there was so much variation from one tank to the next that it was impossible to tell that mileage was better with 5W-20. In fact, the average between the two was slightly better with 5W-30.
It may not very scientific, but since I tow a travel trailer and Chrysler has the grille shutters programmed to let the temperature get up to about 230F before they open, I figure I'd rather have 5W-30. Apparently any change in gas mileage between 0W-20 and 5W-30 is barely noticeable.
It may not very scientific, but since I tow a travel trailer and Chrysler has the grille shutters programmed to let the temperature get up to about 230F before they open, I figure I'd rather have 5W-30. Apparently any change in gas mileage between 0W-20 and 5W-30 is barely noticeable.
You answered your own question:
The Pentastar was designed for 5w30.
The engineers didn't necessarily write the current owner's manual, it was written with CAFE in mind.
The Pentastar was designed for 5w30.
The engineers didn't necessarily write the current owner's manual, it was written with CAFE in mind.
Was it though? There have been three iterations;
2012-2013 was 5w30
2014-2017 was 5w20
2018+ which is essentially an entirely new valvetrain - 0w20
Mine is a 2015 but I use mobil 1 FS 0w40.
Is this the jeep you are doing 2500 mile oil changes and 25K mile coolant changes on
Triple_Se7en
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Wow, thanks, I feel good. Can you please explain more how it is like 5W30
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Yeah
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More additives don't make up for higher viscosity?
20 weight PP and pup virgin oil tests usually test out as having a viscosity of around 9 to 9.5cSt at 100 degrees Celsius.
20 weight oil viscosity range is 5.6ish to 9.5 or "greater than 9.3cSt".
30 weight oil is 9.3 to 12cSt at 100c.
So a 20 weight could have a viscosity 6 cSt at 100c and be a "20 weight" that is very thin oil and many people believe oil that thin doesn't provide enough protection to give you a very long lasting engine with modern problems like fuel dilution and unusual circumstances such as towing or prolonged highspeed operation.
20 weight can be as thick as a 30 weight oil, for PP and pup this seems to be the case.
Mobil1 fuel economy oil tests out as like 8 cSt at 100c and Toyota dealership bulk oil tests out around 6 to 7 cSt at 100c.
So there are very think 20 weight oils on the market.
If you’re not going to tow, off-road or go on long road trips, 0W-20 should be fine.
I run 0W/20 in my Silverado. Towing 5,000 pounds up 9,000 foot passes in 90 degree heat. How much more severe should I worry about?
This thread will be a good addition to the next "thick vs thin" thread tome.
I am not sure if there is an "off-roading spec" as you put it.
Corvettes for example spec a Dexos R oil in 0w40 or 5w50 when used on a track. I would assume that this is because of the higher loads and higher temps.
I submit, that real off roading (loosely used term, not on a trail, but like what you might see around Moab or the like) would be just a strenuous if not more than track racing, due to loading and lack of cooling.
Recently, I found a manual for my Land Cruiser from the South America/UAE. There is gives a wide range of oils for usage and temps. In the USA, it specs 0w20 or 5w20, but in other places, they allow from 5w30 all the way up to 20w50. This is in a 3URFE engine.
Most do notreally wheel their jeeps anyway.
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