2000 triton v10 e450 super duty rear differential fluid

Factory fluid is full synthetic, but I'm a big believer in doing an oil change after break-in, so even though they say lifetime, it's a good idea if its never been done. As J-D mentions, 75w-140 is the way to go.

Don't cheap out and put in conventional. Interval drops to 3,000 miles if you put conventional in the axle!