Gear Oil Question
#1
10-09-2007, 06:14 PM
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#4
10-09-2007, 10:13 PM
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RE: Gear Oil Question
the 90 is like how easily it moves, the lower the better really
the 140 is the amount of protection it offers
like... SAE 30
move and protects like 30 weight
0w-40(synthetic)
0 - moves VERY easily
40 - protects like 40 weight
you should be putting in 75W-90 with a botle of friction modifier into your diff
the 85w is thicker and is not going to circulate around the diff as easily as the 75W would
the 140 is the amount of protection it offers
like... SAE 30
move and protects like 30 weight
0w-40(synthetic)
0 - moves VERY easily
40 - protects like 40 weight
you should be putting in 75W-90 with a botle of friction modifier into your diff
the 85w is thicker and is not going to circulate around the diff as easily as the 75W would
#5
10-10-2007, 04:46 PM
RE: Gear Oil Question
well actually......
Your dealing with a multi grade oil. The numbers refer to viscosity (thickness) at different temperatures. cold and hot.
With out getting too complicated in the case of you gear oil 85w140 the 85w refurrs to how it flows when cold. W=Winter the second # refurrs to how it flows when hot (can't remember the actual temperatures when its tested) so like a 140 weight oil.
So comparing different multi grade oils
a 75w90 compared to a 75w140 (factory fill with towing package) both would flow the same when cold (75w) the 75w140 would be thicker when hot than the 75x90.
That's one of the benefits of synthetics, they can flow easily when cold and they don't thin out when they get hot. 5w50 motor oil is thin enough for winter use but stays thick enough when hot to protect properly during heavy use on a very hot engine.
So your 85w140 is a bit thick for winter use(not horrible though)but would be great for heavy loads and towing in a warm climate.
Your dealing with a multi grade oil. The numbers refer to viscosity (thickness) at different temperatures. cold and hot.
With out getting too complicated in the case of you gear oil 85w140 the 85w refurrs to how it flows when cold. W=Winter the second # refurrs to how it flows when hot (can't remember the actual temperatures when its tested) so like a 140 weight oil.
So comparing different multi grade oils
a 75w90 compared to a 75w140 (factory fill with towing package) both would flow the same when cold (75w) the 75w140 would be thicker when hot than the 75x90.
That's one of the benefits of synthetics, they can flow easily when cold and they don't thin out when they get hot. 5w50 motor oil is thin enough for winter use but stays thick enough when hot to protect properly during heavy use on a very hot engine.
So your 85w140 is a bit thick for winter use(not horrible though)but would be great for heavy loads and towing in a warm climate.
#6
10-10-2007, 11:00 PM
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RE: Gear Oil Question
Thanks for the adivce, i know your suppose to use 75w-90, but when i went to the parts store, they didnt have any additives for the limited slip and i saw the 85w/140 that says in big letters "LIMITIED SLIP" so i just grabed 3qts. Im gonna go take them back and go to a different part store that sales the additive and get 75w-90.