The selection of the correct transmission oil is, therefore, always a compromise between requirements which are often in complete opposition.”Ĭoncept #2. For example, oils which increase the life of synchromesh units have the opposite effect on the ring and pinion. “The composition of a transmission oil has a varying effect on the service life of different parts of the transmission. Be sure to figure in shipping when pricing it. I bought Swepco from Amazon recently for $70, with shipping included. OTOH, there is also a Torco school of thought in the PNW. Swepco has long been considered the top choice for racing those old Porsches, because racers (not amateurs, but the pros, including factory sponsored teams) found that the transmissions lasted a lot longer with it than with other quality gear oils. I can't recall if Porsche used brass parts in their typ 901/911/915 transmissions but I think they did.

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