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Old 05-11-2015, 10:42 PM   #1
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80-90 Gear Lube

Going to drain the differential and refill. FCCS Tech Support says my coach (2001 XCS) will take about 16 quarts of 80-90 Gear Lube if I just drain the housing.

General Question for those who do this: What brand do you use? I noticed O'Reilly Auto Parts carries a "Master Pro Chemical" brand that is less expensive than the majors and meets the same specifications. Anybody use this brand?

WM
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Old 05-11-2015, 10:47 PM   #2
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I stick with name brand lubricants. Not worth the savings on something as important as this.
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Old 05-11-2015, 10:51 PM   #3
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If it meets the specs it is good.
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Old 05-12-2015, 12:27 AM   #4
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I would recommend using an extrem duty or heavy duty synthetic gear oil 80-90w.

The vehicle is used to move a lot of weight, that is why I suggested the heavy duty synthetic gear oil. The synthetic should also help with milage.
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Old 05-12-2015, 12:34 AM   #5
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Quote:
Originally Posted by hypoxia View Post
If it meets the specs it is good.
But how do you know if it actually meets the specs? Cheap products might not have been tested at all. Even Amzoil (not cheap by any standards) says they meet specs but they don't seem to bother doing the testing to prove it.
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Old 05-12-2015, 08:02 AM   #6
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When changing differential oil, make sure it is comparable with the old oil.

It will mix with the wheel bearing oil, on floating axle, differentials used on our motohomes.

You could pull the axles, to drain most of the old oil, but without pulling the hub, there will be some left.
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