Quote:
Originally Posted by winders
What is the major wear item in a 915? It doesn’t have rings and no plain bearings exposed to the transmission oil. It is the synchros. Guess what, the synchros wear from day 1 to the day the transmission is taken out of service to be rebuilt.
You want to change the transmission oil after breaking in a 915, go ahead. But you are wasting time and money.
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+1 on what Winders said. You don't need to "break in" a manual transmission, and synchro wear is a constant over the life of the transmission. As for what oil to use, I've used the SWEPCO and Valvoline mineral based oil (not synthetic). I can't tell the difference in a 915 in a street-driven car. The shifting still sucks, compared to more modern designs.