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mikefocke · 08-05-2008, 08:27 AM

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.

08-05-2008, 08:27 AM	#8
mikefocke Registered User Join Date: Aug 2005 Location: Sanford NC Posts: 2,537	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.