75/90 Syn VS. 75/140 Syn
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From: Coal Country, ND
75/90 Syn VS. 75/140 Syn
I know that the owners manual for my '05 calls for 75/140 syn, but I can get 75/90 syn at work for a pretty good price.
Should I even consider using it?
Should I even consider using it?
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From: round rock, tx
what brand of gear oil you getting for a great deal?
i recomend Amsoil or Mobile 1 (try Lucas as an additive)
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From: Coal Country, ND
I forgot to specify that I'm talking about the rear axle, 10.5 LS. And yeah I know that the manual says to use 75/140 in it.
I believe that the gear lube at work is Mobile in the 75/90 flavor. Should it even be considered for the rear diff (along with the Ford friction modifier)?
I believe that the gear lube at work is Mobile in the 75/90 flavor. Should it even be considered for the rear diff (along with the Ford friction modifier)?
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From: Long Island USA
Over the years of the Sterling 10.5/10.25" rear used by Ford, I think they had a lot of pinion bearing failures when they first started using these rear-ends. I believe they were using regular 75w90 dino oil at first.
Since then, they switched to 75w140 full synthetic, and the failures went away.
I wouldn't stray too far from what Ford says to use, especially with the 140 vs. 90.
Unless you never tow, never carry a load, and do not have oversized tires, I wouldn't chance it.
Since then, they switched to 75w140 full synthetic, and the failures went away.
I wouldn't stray too far from what Ford says to use, especially with the 140 vs. 90.
Unless you never tow, never carry a load, and do not have oversized tires, I wouldn't chance it.
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