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Originally Posted by x54.4blue
Didn't they recently reformulate M1 and come out with a extend life version.
Wonder if they reduced the basic M1; my mechanic claims that the basic M1 now looks really black at oil change?
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Why they came out with the extended version is anyone's guess considering the regular the M1 Tri-Syn used to produce great UOA's. Many people have speculated that the current Extended version might be what the original M1 Tri-Syn used to be.
Either way, the current regular M1 regular Syn formualtion is what is under scrutiny.