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Front diff oil?
I'm using Amsoil in 05 F 150. Dealer didn't have 75/90 but said that 75/140 would work just as good. which should I use?
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I would use the 75w90. That is what it calls for. Rear is 75w140.
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Nope, you can't use 75w140. Here is the Amsoil compatibility chart:
Standard Differential, Rear......GL-5 All TEMPS......75W-140 [2] [3] SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT) 80W-140 Synthetic Long Life Gear Lube (FGO05) Limited Slip Differential, Rear......GL-5* All TEMPS......75W-140 [2] [4] SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT) 80W-140 Synthetic Long Life Gear Lube (FGO05) Differential, Front......GL-5 All TEMPS......80W-90 SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT) 75W-90 Synthetic Long Life Gear Lube (FGRQT) SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT) SAE 80W-90 Synthetic Gear Lube (AGLQT) |
I was planning on using 75/90, but the dealer said it be ok with the other. I guess I'll find 75/90 in another brand.
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Have him order some 75w90, or order it yourself.
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I would order it, but it will not be here in time. Thinking about using Royal Purple.
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i wont put anything purple in my truck ever again. i have been using valvoline synthetic gear oils
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It calls for 80w90 conventional, so any synthetic 75w90 would be fine - even Walmart Supertech. It's not critical.
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I ended up using Lucas in the front diff. It was a little milky looking. The rear was clean looking, but changed it anyway.
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If it was milky looking, you've been getting water into it.
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It's got new oil & gasket. Hopefully that solves the water problem. I was surprised when I drained it.
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Check the vent, water may be getting in through it.
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Where's the vent at?
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