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Synthetic in an M41? 120-130 1966

So, I'm putting the M41 back together,

(no, never found the needle bearings- they can be had from Sweden, but I found a good used set)

and I'm wondering- is synthetic gear/motor oil (specifically Redline) compatible with the overdrive?

I could see problems with the friction surfaces not getting sufficient grip.

Also, ALL of the M40's and 41's I opened had gear oil, not motor oil. The official spec was 30 wt for the OD units, no? What do you- all run?

Thanks!
Toby






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