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Yep! Used to use the Valvoline Racing 15W-50 in my hot-rodded VW flat-fours and it works fine, just like it does in 911s! Castrol GTX 20W-50 works great, too! The owner's manual in my 911S says SAE 30 weight, also, but that recommendation is a little 'dated' to say the least!
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Warren Hall
1973 911S Targa
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