If you want to get alot more of the old, dirty oil out of the engine, let it drain normally but after the dripping stops and before you close it all up, disconnect (at the air tube) the breather hose that runs from the air tube to the valve cover and blow into the hose long and hard 5-10 times. Of course you can put your lips on the valve cover fitting if you want but MAN THAT BABY'S HOT!! You'll be suprised how much more oil comes shooting out the drain! I get AT LEAST another 1/4 qt. and maybe more.