I'm sure this has been addressed before but I could not find the exact answer. The M25 in out E32 is installed at a 13 degree down angle. When changing oil I can only get a little over 3 quarts out thru the oil pan drain plug suction hose. The rated capacity is 4 quarts. I am thinking there could be up to a quart remaining in aft part of the oil pan. Has anyone a method to get this last quart of oil out when changing oil? One fellow on our dock recognizes the problem and just drains, refills, warms up and redrains to dilute the remaining quart and says that has to be good enough. I am kind of hoping there is a more eloquent method.