I'm currently using heavy hypoid oil in my TR4 gearbox, which is fitted with
overdrive. I've read that a lighter oil should be used, that the syncromesh
gears don't like the heavy stuff. However, I've been running this oil for a
number of years, and the gearbox shows no signs of problems. Is this a case of
"if it's not broke, don't fix it"? What are recommendations of proper
viscosity. I don't have the workshop manual in front of me, but I'll bet it
calls for the heavy oil.
Thanks,
Paul
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