I recently did to rear differential oil changes on my 2020 and 2022 trucks with Amsoil 75-90. 45K and 30K miles. Owners manual states ask dealer regarding service intervals. Zero info on what type of oil and quantity needed.
#1 2020 Silverado 2500HD with 45K miles Duramax- Easy peaky drain plug at bottom ant fill plug at top. Dropped the bottom plug and got about 4.5 quarts into the drain pan. This is about the same amount that went back in to make it dribble out of the fill hole on level ground. Truck is a combo towing vehicle 10K trailer, snow pusher, and soccer mom taxi. old oil came out looking pretty good.
#2 2022 Silverado 3500HD DRW Duramax with 30K miles pulls trailers up to 16K half of these miles. No drain plug only fill plug on the cover. Ordered new gasket and pulled rear dif cover. Only got about 3 quarts of oil out after I pulled the cover. The oil was not horrible but definitely brown. I examined all the seals and found no indication of leakage. My only thought is that it was shipped low from the factory, because it required 4.5 quarts of 75-90 to make it dripple out of the fill plug hole on level ground. Would have gladly paid a few extra bucks up front for a drain plug.
Also zero info on rear end bolt tightening pattern and torque specs. Must be top secret!
Has anyone else had a similar experience???
