I have 2 advantage. (1) I typically change it a couple times a year, so it is about 1-2hrs to swap them out. (2) I worked in off highway drivetrain industry for 16yrs. Gear lube smells familiar and nostalgic. Makes me smile. Our largest axle took 80 quarts in the center housing, 20 quarts in each planetary wheel end, and another 15 quarts of brake fluid in each wet disc brake. You get used to the smell very quickly!