Quote:
Originally Posted by spuggy
Two highly-regarded Porsche independents I've been very happy with both have Shell Rotella T Heavy-Duty 15W40 as a shop fill for air-cooled turbos -
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I used that for my 930, as well. But then the local auto parts stores stopped carrying the "old" formulation, and now have just the newer (non-ZDDP) stuff. So I've switched to 20w-50 (or I suppose I could just run the straight 50w stuff here in CA)--either Valvoline VR-1 or Brad Penn.