I know I've got a GM (2.8) engine....

but, when I drain my oil it's exactly 4 quarts, pours out of the drain pan and fills a 1 gallon bleach bottle to take down to the parts store. I then put 4 quarts back into the truck and drive another 4,000 miles and repeat.

Now that I think of it, I've only ever had one car that consumed/leaked/burned oil... including all the neglected used hooptys I've owned.

What's the contributing factor?