We have three classes of motor oil- GOOD, BETTER, AND BEST. Our "good" oil is good for 3k to 5k miles, Our "better" oil is good for up to 10,000 miles or six months, whichever comes first. Our BEST oil is good for 25,000 miles or one year, whichever comes first. It is a one-year maintenance program. We have the oil which is good for one year, an oil filter good for one year and an air filter clean once a year with a vacuum cleaner and good for four years, with cleaning once each year.