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Fwiw I'm running T6 at 7500 mile intervals in my 255k mile OM648 that's driven pretty hard and short tripped often with 0 consumption

I have an '03 Silverado 3500 dually. 11.5" AAM rear end. I changed the fluid back in march, and hadn't really thought much about it until recently when looking at other fluids while ordering (I own a repair shop). I stock a bunch of LiquiMoly gear oils, and I've come to realize I've purchased...