Oil Recommendations for 19 PP2

[Dfeeds]

So where's all the proof that viscosities higher than 5w20 is better (other the 5w50 which is ONLY recommended for supercharged applications)? Good quality 5w20 is all you need. As for differential temps, header wrap on the axlebacks works wonders on reducing diff temps.

Not that I'm a thicker is better advocate but the proof is out there. There's SAE papers you can hunt for on bitog. One was a test that used two identical engines. One half of each engine was coated with friction modifiers and the second half wasn't. On the non friction coated side, the thicker oil did protect better. However, on the friction coated side, wear was identical and in some cases better with the thinner oil. So there are advantages to 5w20 but just having a blanket statement that "5w20 is all you need" is just not true. It's per application, and not just boosted engines.

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[dn1984]

Not that I'm a thicker is better advocate but the proof is out there. There's SAE papers you can hunt for on bitog. One was a test that used two identical engines. One half of each engine was coated with friction modifiers and the second half wasn't. On the non friction coated side, the thicker oil did protect better. However, on the friction coated side, wear was identical and in some cases better with the thinner oil. So there are advantages to 5w20 but just having a blanket statement that "5w20 is all you need" is just not true. It's per application, and not just boosted engines.

are you saying 5w-20 with ceratec may be better than 5w30 with ceratec?

 

[Dfeeds]

are you saying 5w-20 with ceratec may be better than 5w30 with ceratec?

No. Cetatec is an oil additive. Friction coatings are added during assembly, directly to the parts, and perform well beyond what any oil additive can do.

 

[Andy13186]

The oils I would use are amsoil signature series 0w30 (expensive) or castrol edge extended performance 5w30 or pennzoil ultra platinum 5w30. And I do always add ceratec since I had the bbq tap. I may try motorkote.

 

[tal]

Is the OEM diff oil a synthetic? I thought it was?

The A6 auto trans is a semi-synthetic as I have heard.

 

[dn1984]

No. Cetatec is an oil additive. Friction coatings are added during assembly, directly to the parts, and perform well beyond what any oil additive can do.

So do we have that on our cars?

 

[GregO]

So where's all the proof that viscosities higher than 5w20 is better

JLR Supercharged 5.0's Spec. 0W-20 @ 15k OCI................ I agree, "Where's the Beef" ?
I sleep well running 0W-20 in my RRS SC and GT 5.0 year round.
As mentioned in past posts 0W-xx is superior to 5W-xx

 

[Matti777]

I always thought 5W20 was recommended because it reduces internal losses (viscous drag) and 5W30 provided better protection but what do I know?

 

[dn1984]

Maybe I'll try 0w-20 on my next oil change

By the way if you guys aren't buying Castrol GTX Magnatec you're missing out on the best value full synthetic out there

https://www.amazon.com/Castrol-03060-MAGNATEC-0W-20-Synthetic/dp/B00TS9ZW3Y

 

[EFI]

So where's all the proof that viscosities higher than 5w20 is better

The proof is simply in the spec sheets (specifically viscosity values) provided by the manufacturers.

The Coyote motor was designed for a specific viscosity oil at operating temp. When an oil gets heated up, it thins out...that's a pretty well known fact. So when an oil gets heated up to 275*-300* F, it no longer meets the viscosity requirements set by the manufacturer. That's why a thicker oil (like 5w30 to 5w50) is better suited for track applications where excessive heat is expected, because a thicker oil will thin down to the proper viscosity at higher temps.

Basically, you want "5w20" viscosity at 275*-300* F...the only way to achieve that is with a 5w50 or thereabouts.

 

[shogun32]

The Coyote motor was designed for a specific viscosity oil at operating temp.

and I'll bet the bearing journal tolerances haven't changed a scintilla since Coyote v1 and yet they keep moving the oil viscosity lower. It's all a con for CAFE purposes. Somewhere on the board was a thread that posted cSt@40 and cSt@100 figures and if my memory serves you want an oil that is 10-12cSt@100. Then just pull up the tech sheet on your favorite oil and see what number they cite.

 

[EFI]

and I'll bet the bearing journal tolerances haven't changed a scintilla since Coyote v1 and yet they keep moving the oil viscosity lower. It's all a con for CAFE purposes.

While CAFE is definitely a factor in the oil choice for the Coyote, I think it's always been 5w20 for regular use dating back to 2011 so it never changed in that regards.

It only changed up (thicker) for track or expected track use.

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