Quote:
Originally Posted by TrackClub
MJK: BOTH 0w40 and 5w40 dexos 2 oils have been certified by GM as good for BOTH street and track duty. 5w40 dexos 2 is NOT track ONLY oil! 15w50 is.
Moreover id argue that 5w40 is a much better summer oil to provide motor protection during hot summer vs cold winter starts. Especially in hot climates.
IMO there is nothing "magical" about the Mobil 1 0w40 except it now gives GM dealers ability to service GM performance cars with dexos 2 oil vs old 5w30 which was street only. Thats it!
Where do you get a notion that Motul has some additives that are cats unfriendly???
I think folks are reading way too much into this GM ***dealers*** marketing release and jumping to huge conclusions based on unjustified assumptions.
NB Corvette Racing team uses Mobil 1, Valvoline and Motul as their choices for lubricants. All three are top notch companies. And all 3 make GM certified top quality dexos 2 oils! And THAT is what GM recommends to be used in our cars in either 0 or 5w40 spec.
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Perfect answer. Covers it all.
