My '80 Capri RS Turbo has the Borg Warner 4-speed manual transmission. Can it be drained from the bottom tailshaft bolt? Also, what fluid(s) can be safely used in this tranny? It looks like it specs GL-4 fluid, and most gear oils are now GL-5. I have read that GL-5 is not ideal in manual transmissions due to the fact that it damages the brass parts.
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