Oil - going from 0w20 to 0w40

[JTGuy]

I remember adding STP in my 70 Bronco. If thick oil was the secret then STP was the answer. Oil does not fix bad design.

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[Jrgunn5150]

Go straight to the Amsoil 90/140.

Should be good for 5 million miles then.

 

[DrewsJT]

I don’t think that video says the recommendation to switch to 0W-40 as a precaution had changed. Ray said the updated recall was expanding owners vehicles instead of just dealer inventory.

https://static.nhtsa.gov/odi/rcl/2025/RCRIT-25V274-5347.pdf

They are replacing the engine and installing the 0w-20 cap on the new engine

 

[ShadowsPapa]

GM is the guy behind the curtain, who when someone catches a glim

https://static.nhtsa.gov/odi/rcl/2025/RCRIT-25V274-5347.pdf

They are replacing the engine and installing the 0w-20 cap on the new engine

Exactly. That's what I said in another one of these threads.
Leave the ones before and after the affected dates alone (proving it wasn't an oil issue) and once the engine is replaced, go back to the book and put the prior cap back on.
Again proving it was simply a bandaid on an artery, not a fix - otherwise they'd make it a change and keep it that way.

 

[Hootbro]

Welcome to the 40 grade club. Currently running 5W-40 Quaker State Euro and probably be changing it next week and send a sample off for analysis. Have on deck a jug of Castrol Syntec 0W-40 ready to go in when I replace it.

 

[ShadowsPapa]

Welcome to the 40 grade club. Currently running 5W-40 Quaker State Euro and probably be changing it next week and send a sample off for analysis. Have on deck a jug of Castrol Syntec 0W-40 ready to go in when I replace it.

Do you pay any attention to oil temperatures?
Just curious, wondering........

 

[Hootbro]

Do you pay any attention to oil temperatures?
Just curious, wondering........

Why yes I do.

86 degree day today and oil temp was around 200-202 degrees on my 40 minute drive home.

 

[JTGuy]

Oil. is not the problem with the cams. It's product failure. Thicker oil is not going to make a difference.

 

[Jay Gatsby]

Oil. is not the problem with the cams. It's product failure. Thicker oil is not going to make a difference.

Oil may just be the problem. . . lack of it!

 

[Lunentucker]

@ How many miles was the analysis done?

25,000

 

[ShadowsPapa]

Why yes I do.

86 degree day today and oil temp was around 200-202 degrees on my 40 minute drive home.

it should be pretty much the same since these are "cooled" oil systems, but was curious if you noted any difference but those numbers suggest nothing out of the ordinary.

 

[Sw00per]

I read some time ago the switch to 0w20 was for CAFE standards. I also read in an old 2012 manual that 5W-30 Chrysler Material Standard MS-6395 was the recommended oil. Just some food for thought.

 

[Charles 236]

I read some time ago the switch to 0w20 was for CAFE standards. I also read in an old 2012 manual that 5W-30 Chrysler Material Standard MS-6395 was the recommended oil. Just some food for thought.

The 2012 3.6 was not the same 3.6 as used in current Jeeps, it was the Classic Pentastar (no Variable Valve Lift). It was designed with 5w30 oil specified, and then switched to 5w20 around the '12 or '13 model year. The Pentastar Upgrade engine has always had 0w20 oil specified, it has many differences from the Classic Pentastar. The switch in the Classic Pentastar to 5w20 oil was for CAFE standards, but the PUG was designed from the start for 0w20.

 

[ShadowsPapa]

I read some time ago the switch to 0w20 was for CAFE standards. I also read in an old 2012 manual that 5W-30 Chrysler Material Standard MS-6395 was the recommended oil. Just some food for thought.

LOL, "you read that" LOL.

 

[ShadowsPapa]

The 2012 3.6 was not the same 3.6 as used in current Jeeps, it was the Classic Pentastar (no Variable Valve Lift). It was designed with 5w30 oil specified, and then switched to 5w20 around the '12 or '13 model year. The Pentastar Upgrade engine has always had 0w20 oil specified, it has many differences from the Classic Pentastar. The switch in the Classic Pentastar to 5w20 oil was for CAFE standards, but the PUG was designed from the start for 0w20.

Yeah, I need to post for the tenth time that bit from the tech docs about oil and the vvl, vvt systems..........

And the oil was also made for this type engine. Different bearing materials, different timing chain, different oil pump....

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