Went to the dealer today and got oil and filter. The oil that they gave me was in quarts, 15w40 CL-4, CH-4, CG-4, CF/SL APPROVED, GM Part# 12345634. On the back of the quart it said something to the effect "Recommended for all GM/Chevrolet diesels". Now to my questions: Who makes this oil? Is this the right/good oil for LLY? Is this the same oil that comes prefilled from the factory?


MattEdited by: mattrudella

I'm almost positive it's Mobil. When I was in strolling the Aisle of my Mobil Distributer ,low and behold the had pallets of GM GoodWrench Erl.


Mobil makes and supplies many auto manufactures , Honda too.





Mac Edited by: Mackin

I was told it is mobile. I run it for break in.