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can i run 75-140 dif oil in the front dif to, so instead of buying two different weights for gearbox and rear diff which is rated for 75-140, and the front which is rated for 75-90. ? why couldn't i run 75-140 in the front also?
 

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The visco part of the diff is sealed and doesn't get touched by gear oil. I personally am going to start running 75-90 syn in my rear and front come next change. I don't run wide open or high speed all the time.
 

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My xmr 1000 says 75-90 right on the rear diff.
 

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I put 140 in the front diff just because there was plenty left over from the rear. I don't see how it could hurt it once it warms up it does the same thing as the 90 weight. I don't ride flat out either mostly trail riding. Unless someone says definitely do not run it I'll leave it in there.
 

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I put 140 in the front diff just because there was plenty left over from the rear. I don't see how it could hurt it once it warms up it does the same thing as the 90 weight. I don't ride flat out either mostly trail riding. Unless someone says definitely do not run it I'll leave it in there.

75w-90 runs totally different than 75w-140 once warmed up. They run the exact same at start-up only. I would stick with what your manual says.
 

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I have 80w140 in my front diff for a long time, nothing noticably different.

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can i run 75-140 dif oil in the front dif to, so instead of buying two different weights for gearbox and rear diff which is rated for 75-140, and the front which is rated for 75-90. ? why couldn't i run 75-140 in the front also?
Probably you won't have any problems but a 140 grade is harder to move inside the differential so need more power and another thing is 75w-140 is much more expensive than 75w-90 so get a bottle of 75w-90 and you will have enought for two changes in front,the 75w-140 for your transmission and rear differential:smilietwocents:.
 

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I asked the dealer near me. They said it would be fine but what do they know they probably want something to happen to it so you can bring it in for service.
 

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There must be a reason they are spec'd differently.

We're talking about a tiny amount of money compared with what the machine is worth. I wouldn't use anything but what BRP specifies.
 
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