mobil 1 syn diff fluid

agamache

agamache

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May 12, 2009
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Has anyone ran Mobil 1 synthetic rear diff fluid. if so do u remember if the friction additive was needed
 
I run it, GL-5 rating. I didnt run any additive, but i think i was suppose to.
 
i am going to change it tomorrow and wasn't for sure if i needed to it dose not say if its in it or not.
 
only 53,000. checked the fluid the other day and there was metal shavings on the magnet (normal amount) so i figured i would change it out to get all the metal out
 
Just run royal purple it has the friction modifier already in the fluid thats what ive always ran front and rear even with a locker zero problems!
 
It has a friction modifier package in it, so unless you experience any grabbing, binding, noise etc. from your limited slip differential it is not needed.
 
The factory Ford stuff is full synthetic also. 75w140 goes in the 10.5 axles. A Dually Dana 80 gets the 75w90. Friction modifier goes in anything limited slip if the oil doesn't already contain it. The best modifier is the Ford Motorsport stuff. It smells like Sex Panther from Odeon. Second to that is the GM friction stuff.
 
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