rdv350
Sr. Member
I am in the process of changing the gear oil in my diffs and the trans and transfer case. From what I have been reading in past threads almost everyone recommends using a lower weight oil like 75w-90 for colder temps. Everyone says that a heavier oil like a 75w-140 will get too thick when the temps drop below freezing. Well I was looking in the maintenance manual for my F-350 yesterday and they recommended 75w-140 synthetic gear oil of the rear, so what gives? Why is this recommended for my truck, but I can't use it in my bronco?
My other question is, no matter which oil weight I go with, is it ok to use synthetic gear oil in the trans, t-case, and diffs?
My other question is, no matter which oil weight I go with, is it ok to use synthetic gear oil in the trans, t-case, and diffs?