Quote:
Originally Posted by haggler
There is a oil spec called HTHS (high temp high shear) which dexos2 5w30 has a min value of 3.5. This value is inversely related to fuel efficiency. the 5w30 dex1g3 has a value of 3.0. Street cars are prescribed Dex1g3. The higher value will be better for performance engines driven hard.
GM never had a "performance" spec oil until they branded DexosR, before that they were just using Dexos2 which is for gas/diesel with low sulphur and ash (SAPS) with the previously mentioned higher min HTHS value. Basically dexos2 has a higher bar to meet than dexos1. Realisitically for street driving you could run any dexos1/2 5w30. For track any Dexos2/R 0w40, or M1 15w50, etc.
I run the M1 ESPx3 0w-40 dexos2 because it has Porsche specs, which are higher than anything GM specs for the Camaro/Corvette and its cheapest with the autozone deal.
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Thanks for the info ! These oil threads are never straight forward are they.
Too bad GM wouldn't have made mention to the the video creator when they were discussing this that Dexos1 5w-30 is the default for the normal street driver of a SS/LT1 (and it meets warranty conditions). That really does cover most people who come to these forums and drive a SS.
Anyways we all learned something, thanks to all !