Diff. gear oil?
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Senior User
Joined: Mar 2003
Posts: 296
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From: El Cajon, CA
Diff. gear oil?
What weight is everyone using?
I'm getting ready to install the "Mag-Hytec" diff. cover & they say 75w-140 weight. My Ford book shows 75w-90 for the F350/450 Dana 80.
I'm going to go with the Mobil 1 Synthetic.
We RV a lot, towing trk & trailer gross weight at 21,000+lb.
I'm getting ready to install the "Mag-Hytec" diff. cover & they say 75w-140 weight. My Ford book shows 75w-90 for the F350/450 Dana 80.
I'm going to go with the Mobil 1 Synthetic.
We RV a lot, towing trk & trailer gross weight at 21,000+lb.
Last edited by Sark; Jan 20, 2012 at 03:00 PM. Reason: Found the answer finally in a passed thread
Tuned
Joined: Oct 2011
Posts: 269
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From: Albuquerque, NM
Just changed the oil on my Sterling 10.5 two weeks ago, used Mobile 1 75w-140LS. Since the oil already has friction modifier in it, I didn't add any more to the mix, so far I have not noticed any binding, shutter, chirping etc on tight turns. I believe the Dana 80 uses the 75-90 as mentioned earlier.
Thread Starter
|
Senior User
Joined: Mar 2003
Posts: 296
Likes: 0
From: El Cajon, CA
Just changed the oil on my Sterling 10.5 two weeks ago, used Mobile 1 75w-140LS. Since the oil already has friction modifier in it, I didn't add any more to the mix, so far I have not noticed any binding, shutter, chirping etc on tight turns. I believe the Dana 80 uses the 75-90 as mentioned earlier.
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