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Mobil 1 LS 75W140 with friction modifier

Mobil 1 LS 75W140 with friction modifier

 
  #1  
Old 05-26-2019, 08:48 PM
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Join Date: Aug 2007
Posts: 85
Mobil 1 LS 75W140 with friction modifier

Tried a search and no luck. Just bought a 2006 F-150 4X4 with 98K. Going to have both diffs serviced. I already ordered Mobil 1 LS 75W140 for the fills. What kind of luck have y'awl had with running this gear oil in a limited slip rear without having to add more friction modifier?
 
  #2  
Old 05-26-2019, 09:26 PM
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Join Date: Jan 2007
Location: Vernon, NY
Posts: 8,867
It's easy to find out.

Change the fluid out. If you get clutch chatter, it's time to redo it with some 75W140 with some XL-3 from Ford.
 
  #3  
Old 05-26-2019, 11:43 PM
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Join Date: Jan 2002
Location: Wilmington,NC
Posts: 4,676
Check the owners manual. I think Ford recommends 80W-90 for the front diff.
 
  #4  
Old 05-27-2019, 06:24 PM
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Join Date: Aug 2007
Posts: 85
I think they do. But Motorcraft 80W90 is non-synthetic, and I have read a few complaints about Mobil 1 75W90 being too thin. I have never read about any problems running synthetic 75W140 in the front, and it looks like there may be a few advantages.
 
 


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