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Was told not to change gear oil?
I've been looking at an 01 F350 SC and I brought to a buddies last night to have it looked at. He told me that if the gear oil (front and back) hasn't been changed than I shouldn't change it. He says that as the gears wear and metal comes off, they take up the missing space in the gears. If I change the oil and remove these pieces the gears will slap and I will blow my diffs up. He says hes seen it time and time again.
I've never heard of that. I'm curious as to what everyone else thinks. Should I not change my gear oil?