I just got this wacky idea - suck out the oil from my engine with a suction machine via flexible hose into the oil dipstick tube, then gravity filter it through an improvised funnel lined with, say 15 layers of folded tissue paper, and return it to my engine. If I do this every 1000 miles, I think I can extend the oil life this way. It would work just like a bypass filter but would filter 90% of the oil every 1000 miles. It's not really too much work - perhaps it'll take only 10 minutes to get the oil out of the engine and a day or two to get the oil filtered out. Comments, guys?