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Synthetics Diff oil?

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Old Apr 7, 2011 | 10:08 AM
  #1  
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USMC1968
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Synthetics Diff oil?

Again with a newby post.
I want to change out the differential oil on my 1994 Motorhome based on an E350 7.5L 460. It has the Dana rear 4.10 ratio. I bought it used with 38,000 miles on it and probably has never had it changed. Since it is a motorhome and heavy should I use Synthetic GL-5 SAE90 hpoid oil like Motul or go heavier than 90 since it is a MH?
I have the Haynes manual but cannot find anywhere what the capacity is back there. Thanks again

Semper Fi
 
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Old Apr 7, 2011 | 11:27 PM
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The SAE 90W should be fine. I usually use Mobil 1 75-90W since it's easy to find at the auto parts store.
 
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Old Apr 8, 2011 | 05:21 PM
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75W 140 synthetic is what I would use. Buy it a Wal Mart.
 
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Old Apr 8, 2011 | 06:22 PM
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USMC1968
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Thanks! I was wondering about going heavier since the specs from Ford are for the Van, not for the MH conversion which adds quite a bit more weight.
 
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Old Apr 8, 2011 | 09:15 PM
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If your Diff cover doesn't have a from plug, just pull it off and clean doth sides with a scraper then Brake Cleaner and use Black Silicone to seal it up. Following the directions on the Silicone.

And thank you for your Service.
 
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