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I've always done my own oil and filter changes too. I don't even let the '88 Escort with 507K miles on it go to a quart low before adding oil. At one time I did and I noticed the oil consuption getting worse so I started adding 1/2 a quart every time it gets to that point and the oil consumption hasn't increased since I started doing that. So I think the engine must have been getting some oil starvation even at 1 quart low. At a quart low most 4 cylinder cars are only running with 75% oil capacity in the crankcase.
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