Have bearng clearances changed with new oil requirements?

[dpinvidic]

I have done some limited research on bearing clearance for the 5.7 it is 0.002" across multiple years for 2014 til now.
chat GPT says 0.0009 inches to 0.0020 inches

Doesn't this mean we can still use 10W30 oil instead of the 5W20 oil?

I get start-up lifter tick with the lighter weight oil and it goes away with 10W30. MDS still seems to work fine

 

[ramffml]

There is nothing in an engine that would prevent you from running 5w-40 year round in your location. The whole "bearing clearances" thing is a myth.

Oil changes viscosisty as it increases/decreases with temperature... which means, if you're running a 0w-20 your engine already sees the same "thickness" of oil as 10w-50, just at different temps. A 10w-50 at 200F might be the same viscosity as a 0w-20 at 150F (or whatever, I'm too lazy to look up exact numbers). But you get the point... as long as you're not doing something silly like running pure SAE 80 in your engine, it's not going to be a problem.

0w-30/5w-30/10w-30 are all "30 grade" oils, so they perform more or less same at operating temps, but they have different winter ratings. A 10w would probably be fine for AZ year round, I don't know how cold it gets there. There is a 5C degree difference between 5w-30 and 10w-30.

 

[dpinvidic]

Two things got me going down this road. I have a 2024 grand cherokee 5.7 that started the lifter leak-down after sittingovernight. 10W30 made that go away.
The second thing is that in recent years with the switch to 0W20 oil on all of the car brands (some kind of lower viscosity), we as seeing many more recalls of engine failures based on bearing failures.

 

[ramffml]

Two things got me going down this road. I have a 2024 grand cherokee 5.7 that started the lifter leak-down after sittingovernight. 10W30 made that go away.
The second thing is that in recent years with the switch to 0W20 oil on all of the car brands (some kind of lower viscosity), we as seeing many more recalls of engine failures based on bearing failures.

Surprisingly (or not!?) the hemi has a rock solid bottom end. Bearing failures don't happen frequently, at least not to my knowledge based on forum reports etc. Lifter/cam and manifolds seems to be the 2 main issues of this engine.

But yeah I run 5w-30 too.

 

[dpinvidic]

My "opinion" is that they did not make any special design changes to accomodate 5w20 or 0w20 oil. They just spec'd the thinner oil to help meet CAFE standards.

 

[Kickboxer]

I have done some limited research on bearing clearance for the 5.7 it is 0.002" across multiple years for 2014 til now.
chat GPT says 0.0009 inches to 0.0020 inches

Doesn't this mean we can still use 10W30 oil instead of the 5W20 oil?

I get start-up lifter tick with the lighter weight oil and it goes away with 10W30. MDS still seems to work fine

The problem with AI in doing a search now, is lots of errors are out there. AI only compounds the problem. Chat GPT does not know ****.

 

[Wild one]

The problem with AI in doing a search now, is lots of errors are out there. AI only compounds the problem. Chat GPT does not know ****.

In this case it's right.Bearing clearances haven't changed since they introduced VVT.

 

[bjayscanlon]

I recently sent in a UOA sample to commonaly know company, asking them how my 5W30 did so far, and can (should) I keep using it? They told me the vast majority of the thousands of samples they received from 5.7 HEMI owners were 0W20 and 5W20, but they did see a "few" Hemi's using 5W30 and OW30. They said my sample showed "okay" wear metals compared to universal averages. They also explained that using 5W30 showed no advantage compared to the lighter oils. I was surprised. Is that a CYA type of statement?

 

[Musky Mike]

The thing that no one really talks about is shear over time. Your oil starts out as 5W-20 or 5W-30, but over time it shears and looses it viscosity. Typically, the closer the two numbers (less viscosity improvers), the more stable the oil is. 0W-30 and 0W-40 shear really bad (most brands). in theory 10W-30 (of a good brand) should be more stable, but may lack some cold flow at start up. Cold temp dependent. This why I'm a believer in used oil analysis and see what your oil is doing. Not only for wear, but is it staying in grade, at say 5000 (or 7500) miles it has plenty of additive left, but maybe it's out of grade or close to it. Check it at what your oil change interval is.

 

[danielmid]

The thing that no one really talks about is shear over time. Your oil starts out as 5W-20 or 5W-30, but over time it shears and looses it viscosity. Typically, the closer the two numbers (less viscosity improvers), the more stable the oil is. 0W-30 and 0W-40 shear really bad (most brands). in theory 10W-30 (of a good brand) should be more stable, but may lack some cold flow at start up. Cold temp dependent. This why I'm a believer in used oil analysis and see what your oil is doing. Not only for wear, but is it staying in grade, at say 5000 (or 7500) miles it has plenty of additive left, but maybe it's out of grade or close to it. Check it at what your oil change interval is.

There's a thread of like 3k posts here talking about that and an entire website BITOG talking about everything about oil. All we do is talk oil.

 

[06 Dodge]

I recently sent in a UOA sample to commonaly know company, asking them how my 5W30 did so far, and can (should) I keep using it? They told me the vast majority of the thousands of samples they received from 5.7 HEMI owners were 0W20 and 5W20, but they did see a "few" Hemi's using 5W30 and OW30. They said my sample showed "okay" wear metals compared to universal averages. They also explained that using 5W30 showed no advantage compared to the lighter oils. I was surprised. Is that a CYA type of statement?

If you want a quality oil lab for your UOA use Polaris oil lab, this lab is a spin off of Fleetguard / Cummins, 2 UOA kits that use this lab are Fleetguard and Amsoil, the company who's name begins with the letter B has out dated equipment, it uses outdated flash point for fuel contamination, I sure as heck would not risk a $50K engine by using that oil lab...

 

[bjayscanlon]

I'm open to that idea. Need the input in this crazy confused old world of ours. Just looking for some excellent longevity. The first truck I drove, or vehicle of any kind for that matter, was a 65 Chevy C10. It's still around. That's my standard.