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our air cooled need zddp
Our era of Air cooled Porsches do not have hydraulic lifters. The cams push directly on the tappets. The tappets and/or cams wear out if the oil does not have enough zddp (zinc dialkyldithiophosphate). From what we read on here and on classic car forums, most modern oil does not have enough ZDDP to protect the cams and tappets.
I use Brad Penn which is made in Bradford, PA and meets or exceeds the recommended dose of ZDDP. BP is readily available if you give them a call. Their distributor delivered 4 cases to me a couple months ago. Cost was similar to Mobil 1.
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1975 911S Targa
Silver Anniversary Edition
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