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05-11-2015, 10:42 PM
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#1
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Senior Member
Join Date: May 2012
Posts: 242
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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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Wimberleyman
2001 Cruisemaster/300 Cat
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05-11-2015, 10:47 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I stick with name brand lubricants. Not worth the savings on something as important as this.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-11-2015, 10:51 PM
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#3
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Senior Member
Join Date: Sep 2013
Posts: 2,604
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If it meets the specs it is good.
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2014 Newell 2020P 45'8" ISX 600 HP
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05-12-2015, 12:27 AM
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#4
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Senior Member
Alpine Owners Club
Join Date: Jun 2003
Location: Ontario, CA USA
Posts: 1,411
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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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05-12-2015, 12:34 AM
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#5
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by hypoxia
If it meets the specs it is good.
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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.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-12-2015, 08:02 AM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 37,089
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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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