First read this document -
'Somewhere around 25 years ago a deactivated or buffered sulfur was developed that would react with
the phosphorous to create the protective/sacrificial layer in the conditions created in the gear boxes
(temperature and pressure) without being corrosive to the brass, copper, etc.'
'In normal operation, the sulfur/phosphorous additive forms a black sacrificial coating on the gears and
anything it touches with a little pressure and temperature. As the gears turn, instead of wearing, the
sacrificial coating of additives is peeled off or worn off. This is normal and acceptable in all steel gears.
But when one or more of the surfaces is brass or another soft metal, the sacrificial coating is stronger
than the base metal, and instead of just peeling off, it takes with it a few microns of brass that it is
bound to.'
http://www.widman.biz/uploads/Transaxle_oil.pdf
I use this because it contains no sulfur or phosphorus.
https://lucasoil.com/products/heavy-duty-trucking/synthetic-50-wt-trans-oil
Alan
