Are you running an xxW-40 ?

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5w60 Penrite 10 tenths Premium - in my Commodore SS 6L V8 GM L77 Engine, 2001 Fireblade .929L In-line 4, Ford XR6T Turbo 4L In-line 6. Best oil Ive ever used so far.
 
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See my sig. . . . Just so happens I'm using the grade of oil specified by the manufacturer for each car-except for the Alfa, which specs 20W-40.
 
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My '70 Newport, '66 Newport, and '66 300 all with 383's are running 15w-40 and doing just fine. My '62 Buick is currently on 30w, sometimes 15w-40 and '48 Packard is on 30w. '77 Riviera is on 20w-50.
 
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