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Registered
Join Date: Oct 2006
Location: Mt Pleasant, SC
Posts: 1,170
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personally, just me imho, but I'd be to scared of coking using non synth oils, regardless of zinc levels, especially seeing what my brother went thru with coking in his 930. There are synth alternatives out there with added zinc....I will say, that with the exception of my first oil change at 34,500 miles, I have exclusively used AMSOIL 20/50 high zinc formula, changed the oil every 5K, had it analyzed, at each oil change, and it always came back with continue to use. I now have 140K miles on the car.
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Tim
1986 930
Gone:71,2,4 914's, 70T, 71T(RS),77S
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