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Old 08-05-2008, 08:27 AM   #8
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Join Date: Aug 2005
Location: Sanford NC
Posts: 2,439
Porsche says you can use 90-93 in a 986

Page 174 owner's Manual. 93 preferred.

The lower you go the less power and mileage. But in normal driving, 91 isn't going to hurt...91 is the best I can find around NC (and their mid-grade is 89, not on the survey). In my wife's Acura, I alternate 91 and 89. In the P-car, since it sees so few miles, I do stick with 91 so far but I wouldn't hesitate to mix in a little 89 on a flat ground long trip.
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