how many miles before you add a quart? 500 miles or less is a problem, more than that isn't. how many miles between changes? better be 3k unless you're using synthetic. if all you are doing is adding oil when it's low, you are not changing the oil. there is still lotsa dirty oil to contaminate the fresh oil you put in, not to mention the oil in the filter. driving habits have alot to do with perceived consumption. lotsa short trips, then a long one will burn off stuff in the oil that's not oil, but water, excess fuel, etc. now the oil level on the stick is down and "now it's burning oil!" no, it's not. but, if you are short tripping the car, then the oil needs to changed at 3k, come hell or high water. a long trip will burn off the crap, an oil change lets it out the drain plug. an old man told me a long time ago-change it hot and change it alot. good luck, chuck.