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| Joined: | 03-11-2005 |
| Location: | San Anselmo, California USA |
| Posts: | 983 |
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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.
http://www.kewengineering.co.uk/Auto_oils/oil_viscosity_explained.htm
Scroll down to table 5 and compare.
Kurt