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Old 01-22-2019, 03:07 PM   #41
Aqua Puttana
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Default Re: Rear Differential gear oil change

Originally Posted by ClyneSnowtail View Post
If it was changed to Sae 90 later, it would purely be for fuel economy. ...
That's what I think also. I agree that the 75w-140 synthetic may even be the better choice. That said, engine oil viscosities have been coming down with no real documented problems so thinner may be fine for the differential.

I have no data as to which is better. The data does support that the earlier model Operator Manuals did include 75w-140 synthetic. As long as a quality product is used viscosity is probably not a critical factor.

DAD NAS (N. Amer. Spec) 2004 140 2500 >326,000+ mi. Arctic Whitewash Brush-tone Grey
2006 Freightliner 140 2500HC >172,000+ mi. Arctic Whitewash (Spotted Snow Leopard accents)
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