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Old 08-16-2013, 01:54 PM
1project2many 1project2many is offline
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Join Date: Jan 2013
Location: Lakes Region, NH
Posts: 179
The tighter the clearances, the lower the oil viscosity required to allow sufficient lubrication and cooling at the bearing surfaces.

The higher the viscosity, the greater the power required to move the oil.

Higher viscosity oil has more resistance to "squishing out" of an area and therefore can help quiet noise from pitted bearings. Bearing noise is generally "rumbly" compared to the whine that can be caused by ring and pinion interaction.

Gear oil additives don't get depleted under normal use. Unless it has been overheated or has water or metal contamination, gear oil is generally good for hundreds of thousands of miles.
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