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Old 10-18-2016, 02:56 PM   #1
Monaco Owners Club
Join Date: Jun 2016
Posts: 39
96' Windsor Rear Diff Oil Weight

Should we use 75w-90 or 75w-140 for rear diff?

im in florida.... will probably never take it to freezing temps.... keeping protected under heat is the goal.

called Dana Differential.... they need a part number to tell me... Monaco covered the data plate in undercoating.


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Old 10-18-2016, 03:33 PM   #2
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Join Date: Jun 2014
Posts: 6,597
The Roadmaster Lubrication guide for the rear differential only shows to use 75W-90 Pennzoil Super Gear EW Synthetic. Shows to change 250K miles or 3 years which ever comes first.

Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 10-18-2016, 08:22 PM   #3
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Location: Comox B.C.
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Diff Oil

I have a 1995 Dynasty with the same rear axle.
My manual recommends GL-5 90 weight gear oil or 90W-140 GL5 gear oil.

Here in Canada 140 is too heavy in winter so I use the multigrade oil, actually 85W-140 as I could not find the 90W-140.

Hope this helps.

Dennis Broad
1995 34' Dynasty
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Old 10-18-2016, 08:27 PM   #4
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Diff Oil


Should have read manual recommends GL5 140 (not (90)

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Old 03-29-2017, 05:30 PM   #5
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My manuals were lost years ago. Calling monaco didn't help.

It's a heavy diff, and I'm in Florida. I put in 90w-140 and called it a day.
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