What is the time interval recommendation? I change oil on my Sebring convertible at about 3 months. If I waited the 3000 miles recommended for standard oil mileage, I would change oil once a year. I don't drive my convertible when it rains or snows and infrequently in the winter. I will probably keep the same routine with the roadster. That means my oil change routine will be based on time rather than on mileage.