Updated Dexos 0W-40 oil info for 4.2l Blackwing engines

mzbk2l · Jul 22, 2025

Just poking around on the interwebs trying to figure out which oil I want to use for my oil changes now that my warranty is done and I found this info from GM:

Then searching the term DexosR comes up with this list of licensed oils for our engines:

This may open up some additional shopping options for those of us who buy our own oil. (I couldn't find any documentation that Supercar was Dexos2, for example, but now I know it meets DexosR and is suitable for use.)

NorthernSRX · Jul 22, 2025

Interesting. Helpful.

Oskee · Jul 22, 2025

Mobil 1 ( 10w-40 ) became Dexos2 approved back in 2019 when it became factory fill on the new 2019
Corvette C7 ZR1 LT5 ( 755hp ) motor which now carries the Super Car Lable. ( Ask me how I Know )
Since owning my CT6-V for the
last 5 years thats the only oil l have used with no issuies !
On a side note Mobil 1 also makes the OEM motor oil for Toyota !

mzbk2l · Jul 22, 2025

Oskee said:
Mobil 1 ( 10w-40 ) became Dexos2 approved back in 2019 when it became factory fill on the new 2019
Corvette C7 ZR1 LT5 ( 755hp ) motor which now carries the Super Car Lable. ( Ask me how I Know )

But apparently not all Mobil 1 versions or viscosities; only the two shown below in our 0W-40 viscosity are licensed by GM:

No Supercar and no European car formulas of 0W-40 were licensed for Dexos2 (at least according to the Dexos website). The table in the top post shows we have a greater selection now with DexosR licensing.

mjdart54 · Sep 25, 2025

I've been using Mobil 1 in both my CT6-V and my C7 Z06 for many oil changes it's the recommended oil for both engines

LEGACY_GN · 2025-10-04T18:32:27-0400

I use amsoil signature in all my vehicles which is also Dexos R rated GM dexos R Raises the Motor-Oil Bar for High-Performance Engines - AMSOIL Blog

Updated Dexos 0W-40 oil info for 4.2l Blackwing engines

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