Why would you think changing only 2 out of 3 qts is a good idea? When you change your oil in your car do you drain it, add 3qts of new oil and then top it off with the old oil in the pan? Or do you put 5 qts of new oil in for "piece of mind"? Take your old filter, cut it in half and take the paper element out of it and JB Weld it back together. drill a hole in the end and put a fitting in it so you can put a clear hose on it and you have a scavenger for about 2 bucks.
Extra Quart Oil Change - Harley Davidson Community