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Redline MTL may too light an oil to use on the M410.
I'm uncertain, and walrus3 may have the best answer, yet I believe the M410 seeks a 30W oil.
Did you run the M410 transmission for very long without fluid? Did you encounter any bearing gear noise? A beefy as the M410 roller and ball bearings are in the gear assemblies, they'll instantly begin to wear without being bathed in oil.
Redline MTL is like a 10W fluid and may be too light for the synchros to operate properly.
What Volvo model is this M410 in, anyhoo? P1800 or a 164 or ?
If you have one, the owner manual may indicate the correct oil type and weight (viscosity). Best to use a synthetic.
May want to remedy the cause of the leak.
walrus3?
Sorry and good luck.
cheer,
dud
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yet another puckless fryday nyght in slumkane, the toilet, wackington.
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