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The only leaks my '84 3.2 has had over my 7 years of ownership is when the pressure sender failed. Other than that, it's totally dry and drip free. Doesn't smoke at all.
So I couldn't use either of those criteria to tell if one oil was better than another. Car had Mobil 1 15W-50 when I bought it, I changed shortly to 20W-50 Brad Penn and noticed no difference at all. Later I switched to VR-1 because it was easily available locally, and noticed quieter valve noise immediately. I've been on VR-1 since.
Curious to hear other comments about the Porsche Classic oil, though.
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2018 718 Cayman 2.0
Priors - '72 911T coupe, '84 911 Carrera coupe, '84 944, '73 914 2.0
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