Gear Oil 75w-90 vs. 75w-140 - Defender Source
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Old June 22nd, 2010, 04:39 PM
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steve
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Gear Oil 75w-90 vs. 75w-140

I know there are some real oil gurus out there so could someone school me on the difference between 75w-90 and 75w-140 ?
I'm considering 75w-140 in the tcase to help with spline wear... Is that a good or bad idea?
thanks in advance!
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Old June 22nd, 2010, 05:38 PM
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John B.
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75W140 has double the viscosity at 100 C than 75W90. Using it will consume more power. It provides better gear wear protection , but LT230s do not wear their gears, so it is a waste of time.

The input spline wear problem has nothing to do with the oil. The problem is within earlier boxes as there is no way for oil to reach the splines. The "fixes" provide means for oil to reach the splines. Some people believe that a lot of the wear is due to misalignment of the shafts.
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Old June 22nd, 2010, 06:36 PM
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steve
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Quote:
Originally Posted by Red90 View Post
75W140 has double the viscosity at 100 C than 75W90. Using it will consume more power .
That is not what I need!
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