Rearend Lube
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Tuned
Joined: Apr 2003
Posts: 295
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From: Kountze, Texas
Rearend Lube
A couple of weeks ago I changed the rearend lube in my 2010 F-150 Lariat. I re-filled it with a synthetic 75W-90 lube. The other day I found that I should have used 75W-140. Should I change it out to the correct stuff, or just let it go?
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
the second number is the viscosity of the oil when it is HOT outside, or your pulling a trailer and working the rear end harder. If you were in Canada, it might not make any difference... Since your in Texas, I think the THICKER lube would be better in the long run. Not an immediate concern today.
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