Wow I had no idea so many of our engines had "normal" oil consumption in this sort of range (1qt per 1 - 1.5K it sounds like?). I change my oil pretty religiously at 3K miles or 3 months, and I'm still using 5W30 Motul 300V (which, while expensive and an excellent lubricator, as noted elsewhere isn't designed for long change intervals at all, and is low on detergents). Another reason I change more frequently is I have an oil cooler which I'm not draining on change, so every change leaves behind a considerable amount of used oil mixed in as well. I've never even seen a whole quart lost per 3K change, generally the loss is small enough that I hardly notice (under half a quart).
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