rear diff question - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 10-03-2012, 10:13 AM Thread Starter
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rear diff question

I service the rear diff every 50,000km I know its a little much but gives me piece of mind. Ive always used boss 75w140 synthetic with the friction modifier. Right on the rear diff it recommends 75-140 I was just wondering is this to thick for a canadian winter? Ive never seemed to have problems with it but i don't think id want to go with a thinner oil because of the lift and tires I have I feel like it wouldn't be good enough protection. Anyone want to add their two cents?

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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