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post #1 of 8 (permalink) Old 09-19-2011, 03:55 PM Thread Starter
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Rear Differential Fluid Questions

I am going wheeling tomorrow, and wondering if it is ok to use a 80W90 fluid in the rear diff, until my synthetic AMS Oil fluid comes in. Probably looking at a 50 mile run.
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post #2 of 8 (permalink) Old 09-19-2011, 04:33 PM
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That is what I use. Standard hypoid gear lube.

What atv are you putting it in??

2007 Sportsman 800
1500 miles, mostly at Hatfield-McCoy trails, WVa.
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post #3 of 8 (permalink) Old 09-19-2011, 05:29 PM Thread Starter
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Its a 2004 Sportsman 600 twin, I just changed it with the 80W90, the new synthetic AMS Oil should be here in a week or so. I am glad I did, it was as black as all of the other oils, the way I look at it, its a good flush before the new AMS goes in. Also a good time to clean the magnets, a little metal on them but who knows when they were last done. I will get on a schedule and do them a few times a year, unlike the last owner!!
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post #4 of 8 (permalink) Old 09-19-2011, 05:44 PM
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I do not have my manual handy. But I do remember it saying that any specific certified oil was good and I think it was rear diff... Everything else (sans engine oil) was specific Polaris specific lubrication. (No known substitutes) You don't have a turf mode in that machine do you? (I don't think so but that's all I could think of that may change things)

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post #5 of 8 (permalink) Old 09-19-2011, 05:48 PM Thread Starter
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No turf mode, I figured for only 1 run and maybe 20-50 miles at the very most it should be ok, then its being drained and replaced
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post #6 of 8 (permalink) Old 09-20-2011, 01:08 AM
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I don't think you'd have problems. I've used 80w90 on both diffs in my previous ride, Outlander, and done over 8000 km with them without issues.


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post #7 of 8 (permalink) Old 09-19-2012, 08:11 AM
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I use Mobile1 GL5 75-90W synthetic in the rear diff and Polaris Demand Drive fuild up front FWIW. Manual does state that GL5 80-90 for rear is acceptable equiv to Polaris product. Does anyone think the Mobile1 product will cause an issue being that the weight range is slightly different? I didn't think it would matter.
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post #8 of 8 (permalink) Old 09-19-2012, 11:19 AM
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Quote:
Originally Posted by girani View Post
I use Mobile1 GL5 75-90W synthetic in the rear diff and Polaris Demand Drive fuild up front FWIW. Manual does state that GL5 80-90 for rear is acceptable equiv to Polaris product. Does anyone think the Mobile1 product will cause an issue being that the weight range is slightly different? I didn't think it would matter.
No, it would be fine for rear diff.


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- GPS Garmin Dakota 20
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