I have a 2001 Toyota Corolla. It's been a fine car, but has one problem--since 2003, when we bought it (used by an old lady who drove it only to the grocery store and to church once in a while), it's been using more oil than it should--more than a quart every 1,000 miles. It doesn't smoke, and there are no leaks, so it must be burning oil. My husband says it may be because the first owner (that old lady) didn't break it in according to your recommendations, and we'll always have this problem with the car. What do you think? Is there any way to cure it?