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1981 911 SC Oil Change

Engine

Vehicle Information: Model: 911SC; Year: 1981; Body Type: Targa; Total Mileage: 57k;

I drive my car less than 2000 miles per year, year-round, and change the oil once per year, usually in early spring. Given that this oil change will have to suffice for both summer and winter driving conditions, I'm wondering what the best, most versatile choice of oil grade would be. Something in between 10W-40 and 20W-50? 15W-40 or 15W-50? I do not use synthetic motor oil.

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