View single post by Jensen Healey
 Posted: 10-07-2014 05:36 pm
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Jensen Healey

Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
Hi Frank,

Most gear oils contain sulfur. It is a great high pressure additive where no brass or copper parts are present.

In our 4 speed transmissions, the syncro rings are brass. The recommended oil is 20-50 motor oil which has no sulfur.

Viscosity ratings are different for motor oils and gear oils. 20-50 motor oil has about the same viscosity as 75-90 gear oil.
Scroll down to table 5 and compare.