[VR Baron]

Originally Posted by FarmerFran

I thought that was not "real oil"

Haha. It’s what gm uses as factory fill. Crazy thing is,it and castrol only dexos 2 certified in 0-40 we can get. If you want to maintain warranty.
Mobil one is fine for street use. I used maxima and Joe Gibbs when I had a cam and aftermarket valve train.

[95 imp]

My advice is if you street drive it like a grandma go with the 5-30.
If you street drive it hard, or drag/track it, go with the 0-40.

0-40 is preferred. 5-30 is acceptable.

[Msquared]

Guys, 5w30 is only "okay" if 0w40 isn't available. It's available. It's not even that expensive now. Rockauto sells Mobil 1 0w40 ESP for $6.72/qt. There's really no excuse for not running the actual specified oil. Compared to 5w30, it's thinner at cold startup when you want it to be, and thicker at high temps when you want it to be. On Mobil's own spec sheet it lists the kinematic viscosities at 40C (102F, which is basically a cold start on a hot summer day) and at 100C (fully warmed up to operating temps). At cold startup on a hot day it will take the 5w oil 14% longer to reach lubricated parts because of its higher viscosity. At high temps its higher viscosity and higher high-temp/high-shear viscosity will protect those same parts better.

[uvraise]

Manual for my 21 SS says 5-30, Dexos 2

[Msquared]

Originally Posted by uvraise

Manual for my 21 SS says 5-30, Dexos 2

No it doesn't. The manual for a 2021 says the same thing the manual for my 2020 says:

Originally Posted by 2021 Owner's Manual

Selecting the Right Engine Oil (6.2L (LT1) V8 Engine)

Use SAE 0W-40 viscosity grade engine oil...If 0W-40 dexos2 oil is not available, SAE 5W-30 dexos1 full synthetic engine oil may be used for street use.

I really don't understand everyone's fascination with running oils other than what the manual says to use. Mobil 1 0-W40 ESP is available for $6.72/qt from Rockauto now or $48/case with free shipping from Amazon. If you're stranded on a desert island and the only thing you can get is 5w-30 Dexos II, then go ahead and use it. Otherwise, just use what you're supposed to use.

[FarmerFran]

Originally Posted by Msquared

No it doesn't. The manual for a 2021 says the same thing the manual for my 2020 says:



I really don't understand everyone's fascination with running oils other than what the manual says to use. Mobil 1 0-W40 ESP is available for $6.72/qt from Rockauto now or $48/case with free shipping from Amazon. If you're stranded on a desert island and the only thing you can get is 5w-30 Dexos II, then go ahead and use it. Otherwise, just use what you're supposed to use.

What are we supposed to use?

[MakCamaro]

Loool - that ^

[6spdhyperblue]

Originally Posted by Msquared

No it doesn't. The manual for a 2021 says the same thing the manual for my 2020 says:



I really don't understand everyone's fascination with running oils other than what the manual says to use. Mobil 1 0-W40 ESP is available for $6.72/qt from Rockauto now or $48/case with free shipping from Amazon. If you're stranded on a desert island and the only thing you can get is 5w-30 Dexos II, then go ahead and use it. Otherwise, just use what you're supposed to use.

Maybe because the engine didn’t change and we’ve been running 5w30d1g2 for 7 years per their owners manual?

[Invertalon]

Originally Posted by Msquared

On Mobil's own spec sheet it lists the kinematic viscosities at 40C (102F, which is basically a cold start on a hot summer day) and at 100C (fully warmed up to operating temps). At cold startup on a hot day it will take the 5w oil 14% longer to reach lubricated parts because of its higher viscosity. At high temps its higher viscosity and higher high-temp/high-shear viscosity will protect those same parts better.

Higher viscosity?

The 0W40 ESP has a 40C viscosity of 73 cSt and a 100C viscosity of 13.2 cSt.

M1 5W30 at 40C is 64 cSt and 11.1 cSt at 100C.

5w30 is THINNER at 40C. So your point is actually in favor of the 5W30 at those temperatures. The 0w40 has more viscosity at the hot end, though, as expected.

The 0W vs 5W rating is a moot point for most people. 0w will have a lower pour point (something like -50C?) and unless your driving in a place that reaches negative temps often, won't make much difference at all.

[MakCamaro]

2018 Camaro SS

[FarmerFran]

Originally Posted by MakCamaro

2018 Camaro SS

You better change that cap, if you run your car too long with that cap on there your engine is going to blow up!

[LT4Greg]

My ZL1 oil cap has the same 5w30 on it and I am not switching to 0w40 either. Don’t think mine will blow up Farmer Fran!

[Jeb114]

Use what the cap say's that's what the engineers designed the engine it's on, to run with.. Changes from year to year happens but what is on you cap is for that engine!!!!!

[MakCamaro]

I plan to keep the oil cap and keep using the 5W30 oil recommended on it