a1 vs a3 - how important is it really?

JHZR2

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I was thinking... a lot of performance cars prefer mobil 1... mitsu lancer turbo (19 psi I believe!), porsche turbos, subaru wrx turbos, MB AMG supercharged cars... as well as a bunch of na performance cars. and they typically use M1 10w-30, an A1 oil. Now, I think its safe to assume that under high temp/high shear, high stress conditions, and A1 oil will not hold up as well. yet, they reccomend A1 mobil1. Why is this???? -any damage that would occur wouldnt be realized until the car is way out of warranty -the engineers at these companies are idiots or didnt think of it -it doesnt really matter, tolerances could accept a 20wt oil just fine, so long as its synthetic Any ideas? I just have had such a strong feeling of necessity for A3 oils (like in my brother's 3000 GT twin turbo), but maybe its not all that necessary... Any comments? JMH
 

JHZR2

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Messages
46,121
Location
New Jersey
In reading and searching the archives, Ive noted that there has apparently been discussion of how high HT/HS such as in an A3 oil is not necessarily the best thing. However, I didnt see why. The only info I pulled was that the higher the HT/HS, the lower the fuel econony compared to other equal weight oils with lower HT/HS ratings. But what about vaporization or protection, of a synthetic, in a low-revving american engine? Thanks, JMH
 
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