[RWL11]

My wife's new 22 Charger with the 5.7L now calls for 0w20 oil. Anyone know why they changed it? Used to be 0W40 in the 5.7L. Someone mentioned it's better for the lifters.

 

[Hal H]

the 5.7s didn't use 0W40 - it was 5W20 for a long time - my '09 had that spec

the SRT engines have used 0W40 since the start [6.1, 6.4, 'Cat 6.2]

 

[RWL11]

the 5.7s didn't use 0W40 - it was 5W20 for a long time - my '09 had that spec

the SRT engines have used 0W40 since the start [6.1, 6.4, 'Cat 6.2]

You are correct, my bad. still wondering about the switch to 0W20 in the 5.7L.

 

[Hal H]

You are correct, my bad. still wondering about the switch to 0W20 in the 5.7L.

probably to tweak the MPG tests for the EPA cycle

 

[Rockster]

You are correct, my bad. still wondering about the switch to 0W20 in the 5.7L.

The switch from 5w-20 to 0w-20 would be about cold start lubrication. 0w-20 flows better at cold start. That's good.

 

[Smokeshowchallenger]

I watched this video and it made me not want to use that oil…

 

[Frank Julian]

I used to run 10W40 in all my older cars, might go back to that.

 

[SRT8 Mike]

I’ve had a few cars coming to my shop with the check engine lights, and it specifically says wrong way oil. I’m not saying it’s hurting anything but who wants to deal with a check engine light?

 

[Frank Julian]

I’ve had a few cars coming to my shop with the check engine lights, and it specifically says wrong way oil. I’m not saying it’s hurting anything but who wants to deal with a check engine light?

HP Tuners, shut that PID off

 

[DGatzby]

I might try that in our Jeep 5.7. IF I get a light, it could use a little tune anyway now with all the warranty being expired. Plus I already have everything else I need except the unlock of that PCM because we use the HP device on my ‘19 Redeye anyway. My old “gear head” ear cannot stand listening to that 5.7 start up (wife’s vehicle).

probably to tweak the MPG tests for the EPA cycle

I remember reading a few years ago that light oil is necessary to allow the MDS operate appropriately. ANOTHER UNNECESSARY SYSTEM forced upon us.

 

[Slidd]

Dodge themselves said you could run 0W-40 in the 5.7L with 6-speed, you could probably run it with the automatic since the 6.4L automatic has MDS and calls for 0W-40. The lighter oils are for fuel economy period.



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[DGatzby]

Dodge themselves said you could run 0W-40 in the 5.7L with 6-speed, you could probably run it with the automatic since the 6.4L automatic has MDS and calls for 0W-40. The lighter oils are for fuel economy period.



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@Slidd will the 5-30 trigger a warning light? Are they that sensitive?

 

[Slidd]

@Slidd will the 5-30 trigger a warning light? Are they that sensitive?

Some have said it will I guess because of the MDS, but on a 6-speed it won't.


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[StepheK]

0-20 and 0-40 flow the same on cold start up, as the 0 is the cold viscosity. Engines are designed for certain weight oils based mainly on their bearing clearances which maintain their oil pressure. If the engine has good oil pressure, using thicker oil doesn't equate to better lubrication if both oils have the same pressure additive packages. It can actually lower engine performance and if the oil pump ends up bypassing more oil because of this thicker oil, causing higher oils temps. Given most race engines also use these lighter weight oils today, I don't believe this is some sort of Government conspiracy. I do think you need to use higher quality oils in engines that run light weight oils.

"It goes without saying that if the engine clearances are appropriate for a 60wt, you probably shouldn’t use a 5W-20. The opposite is true in that if you have an engine designed for an XW-20, you shouldn’t run a 60wt. Aside from creating excess drag, the 60wt will likely be too thick to get where it needs to go, resulting in oil starvation and ultimately failure."

Why the Heavy Weights of Drag Racing Choose Light Weight Oils - Engine Builder Magazine

 

[Cuda340]

The 5.7 HEMI with an automatic always required a 5-20W oil for the MDS to operate properly.

The newer lighter viscosity spec, of 0-20W reduces internal viscous drag and allows for quick, seamless valve timing changes and MDS hydraulic actuator switching. A 0W-20 oil and a 5W-20 oils has the same viscosity when the oil reaches the operating temperature.

Here's a good article, though rather technical, regarding viscosity. What you'll find is that the real difference between an 0W and a 5W is in two areas- Low Temp Cranking Viscosity and Low Temp Pumping Viscosity. See the first table. Putting the Simple Back into Viscosity - Bob is the Oil Guy

 

[Slidd]

But does the 5.7L use a different lifter than the 6.4L? They both have MDS but vastly different oil requirements, why?


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[Frank Julian]

Some have said it will I guess because of the MDS, but on a 6-speed it won't.


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I no longer have MDS

 

[DGatzby]

Some have said it will I guess because of the MDS, but on a 6-speed it won't.


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That makes sense. Since it is the wife’s DD she won’t like that until I can sneak the PCM away for a day for an unlock.

Then I wonder if she would notice a little performance bump.