Aviation Oil
#2
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as best I understand, aviation-spec oil (for air/oil cooled engines, I assume you refer) does not have the additives that auto application demands. the "non-auto" oil that some have touted for the old 911 is (IIRC) Harley Davidson and Mobil1 for motorcycles, since these are engineered for air-oil cooled motors built kinda like our old lumps.
#5
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You do not want to use aviation oil in any automobile...this is asking for longer term trouble. Av oil has very specific additive packs that are not well suited for a higher RPM motor. There are plenty of very good auto oils available. Why not choose one of them?