I agree they were asking the pumps and WM's to do to much causing failures. The older exmarks I have had held less oil, only 2 qts, than my BB Outlaw with the hydro I forgot the exact amount in my Outlaw but it was more than 4 quarts If I remember right. Retro would know the specs. Maybe the new exmarks unitized pumps hold less but not the hydrogear 5400. Maybe retro will tell us how much oil is in the 5400 and 3400 hydrogear unitized pump and wm on the BB.