I just hit 2,000 miles and I have yet to burn any oil. I'm really impressed with Rx. I'm always skeptical of many products, but like all of the knowledgable people on this site who claimed Rx works, well, it does. Very satisfied. By now, I would have already added 1/4 of a qt. or so. The engine never did really burn that much oil, but it still shows that Rx worked.