I had a '69 Super Beetle that never needed oil change, just more oil. We had that bad boy tuned to blowback everytime you reved the engine and dropped back down to idle. left 2 black marks on the bumper of anyone who got too close at a red light. with current vehicle and previous 2 (All Saabs '85 900s, '91 900s, and '99 9-3) have been on 7000 mile schedule. All have taken many many miles and only gone away because I wanted them to.