Well a standard oil change is basically 5/6ths of the oil out every time, you really never get it ALL. so it shouldn't make a difference. The problem is you're imagining black sludgy oil that you're changing and 1quart d/f isn't going to fix that. Instead if you're really going 1quart/1000miles, what you need to imagine is a perfectly almost clear dipstick and the quart you drain off looks almost identical to the quart you put in and brand new. Then the logic will match your imagination.
Originally Posted By: ExMachina
I think you could. For mitigation, use a full synth, and a great oil filter (change filter every 6 months).... I'd also change it ALL out every 3 or 4 years to be sure.
Originally Posted By: TFB1
In true BITOG logic you could, though most of us prefer to do a complete change...
Originally Posted By: OneEyeJack
So if you're correct then I could just drain off a quart every thousand miles or so and add a quart. Then change the filter every year and my engine will last a couple of hundred thousand miles. You should keep the good ideas coming.