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75w-140 in a 6 speed?

Full Floater

By Full Floater
in Engine and Transmission

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Full Floater

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Any reason not to run 75w-140 in a 6 speed?

One of mine is well worn out and is hard to shift when hot.   Shifts good when cold (think oil) but i'd like to put something in it with a higher viscosity when at operating temp.   So I was thinking 75w-140 and some Lucas.

 

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