Re: trans oil
The way it was explained to me, by an long time flathead owner, is there is additives, including sulphur in some and not in other oils.
He'd seen some gearboxes black inside from sulphur.
I can't remember if it was the GL4 or GL5 that had sulphur in it.
At any rate, the erosion he was seeing was one molecular layer of highly reactive yellow metal at a time being stripped away each time the gears were shifted, or in the case of a model T, thrust washers make a rotation.
If left stationary, they'd take up to 500 years to dissolve.
Not first hand info', make use of it if you want. Basically says driving will wear it out faster.
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