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Originally Posted by MNBoxster
One problem with these compounds is that they can chemically react with the parts in the Transmission, especially Yellow Metal Parts such as some Synchros and Bearings. I cannot find any information on the composition of the Tranny's internals, but if they are using any Brass, GL-5 Lubes can cause premature wear. This is why I would not use the Mobil 1. Instead, I'd go with a GL-4 Rated Hypoid Gear Oil - same Lubrication and Compressability qualities, but does not attack Yellow Metal Parts.
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helpful post. FYI, i had the opportunity to look inside a 986 5-speed this week. the synchros are indeed brass.