Differential gear lube.
This may be like asking "which is the best brand of oil" but I need opinions. I'm due to change the differential gear lube in my 2005 Dodge 2500. Last time I used Mobil 1 synthetic 75W-90. I should...
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I has the same dilemma. I used 75w90 synthetic, and the ring gear area of the rear diff cover would have the paint burnt off it at the end of towing season. I added a huge aluminium rear diff cover and then filled it with Amsoil 75w110 synthetic - which for me was best. I worried about 75w140 being too viscous at low temperatures, like our -40* Canadian winters.
BEFORE:
AFTER:
Note the puddle visible here is just water.
BEFORE:
AFTER:
Note the puddle visible here is just water.
