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Old 05-03-2011, 08:29 PM   #1
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What rating and weight differential oil ??

I can't seem to find anything on any of my manuals about what rating (GL-4?, GL-5?) and weight (80W-90? 75W-140?) differential oil to use on my 1995 Flair 27R with a 454.

Any help is sincerely appreciated. Thanks in advance....
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Old 05-03-2011, 08:42 PM   #2
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Find the GM chassis data for your rig and research further from there. My last Chev 3/4 ton PU required 75W-140 syntehtic if I remember correctly. Go with the requirements for the chassis rather than anything MH body related.
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Old 05-03-2011, 09:13 PM   #3
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I believe the chassis I have is a P30, though I'm not exactly certain.

When I bought my rig, there were many manuals pertaining to the various appliances, but for some reason, I didn't find any "chassis" manual, or any manuals that contain important information such as the type of engine oil, differential oil, transmission oil, etc. I should be using.

Hell, I even had to call Fleetwood to find out how large my fuel tank was, and what capacities of my fresh water, black and grey tanks were.

Anyway, if there are any present/past mid-90s Fleetwood Flair owners, I'd appreciate any kind of input.

Thanks again....
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Old 05-03-2011, 10:14 PM   #4
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The Eaton rear axle that is most used calls for 75W-90 GL-5. You always want GL-5 because it is a lot better than GL-4. As far as synthetic or regular that makes a difference on how often you change it. My MH comes from Monaco with Penzoil 75W-90 GL-5 synthetic gear lube and it is good for 250,000 miles. If it is regular oil it has to be changed at 125,000 miles. Penzoil Synthetic 75W-90 is just about impossible to find anywhere so I top it up with Mobil 1 75W-90 GL-5 synthetic gear oil.

Since you don't know what is in yours then you should totally drain it and replace it. Also check the magnetic plug for any metal chunks. I fine powdery silt on the magnet is considered normal.

One thing that is very important is the level of oil. With a warm rear axle on a LEVEL surface the oil should be absolutely level with the bottom threads of the fill hole. Not down any because your drive axle wheel bearings get lubricated by this oil and if the level is down any then your wheel bearings are not going to be lubricated correctly.
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Old 05-04-2011, 07:40 PM   #5
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I just sold an 07 Chevy Duramax dually, it took 75w90 synthetic...I used Castrol.
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