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...
Forum Discussion
fj12ryder wrote:
Dodge recommends 75-140 for heavy duty towing. Can't imagine why one would want a less viscous lube. It's not like it is being pumped, it just cushions and lubes.
Well, you would think so but I've read threads where guys are measuring the differential temps and report higher temps with the 75-140 vs. the 75-90. Very confusing. I'll bet 90% of the folks pulling trailers have no idea of the need for aluminum covers or going to heavier weigh lube, and you seldom hear of rear ends failing.
I've run Mobil 1 75W-90 with a stock diff cover now for 55K miles pulling 9000lbs. No evidence of over heating by looking at the paint on the cover.
