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Time to change the front and rear diff oil...

I am considering using Castrol Synthetic 75-90 (GL-5?) gear oil. I notice in my owner's manual, CAT specs. 80-90 "hypoid" oil for the diffs. All the "hypoid" oil I find is old fashioned dino...

Any one know of problems going to the Castrol 75-90? I also have a bottle of Amsoil 75-90 gear oil in the garage somewhere as well.

Due to a prior issue with a Jeep (with ARB locker), I know how important getting the right gear oil is.

Thanks in advance!
 

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GL-5 rating does include hypoid compatible specs.

The first number is relative to temperature, the lower it is, the easier the oil will move/flow when it gets cold out. Oil has to move to lubricate, so it's a bit better than 80W for winter usage.

The second number is the viscosity... 90 weight oil is what you need so that's good too. The GL-5 includes a spec for EP properties too, so it's going to do the job as per Cat's requirements. (EP = Extreme Pressure)

I use a Canadian Tire branded oil... 75W90 full synthetic (gold bottle). When it's on sale, it's slightly less expensive than the regular petroleum equivalent.

:chug:
 

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<div class='quotetop'>QUOTE (A G @ Jan 31 2007, 02:45 PM) <{POST_SNAPBACK}></div>
I use a Canadian Tire branded oil... 75W90 full synthetic (gold bottle). When it's on sale, it's slightly less expensive than the regular petroleum equivalent.

:chug:[/b]
Same here.
 

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I use Amsoil in EVERYTHING, how can you not? (jk) :bang:
 

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Yup amsoil in the diff's works great and on the back of the bottle it says what it is compatable with as far as weights.
 

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Does anybody use a marine grade oil? I was thinking that it might help if some water does get in and you continue to ride. What are your thoughts?
 

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sorry to get off topic here but i am from sask to were bouts r u guys from or r u on anyother atv sites
 

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<div class='quotetop'>QUOTE (smokin cat @ Feb 6 2007, 06:21 PM) <{POST_SNAPBACK}></div>
sorry to get off topic here but i am from sask to were bouts r u guys from or r u on anyother atv sites[/b]
seems to be a few more sasky around :thumbsup: I'm sure we will all meet at one of the rallys....



BM...
 

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i just changed mine again with Amsoil Severe Duty 75w90. Any 75w90 GL5 oil will do.
 
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