This used to be an easy answer every 3,000 miles. Today with changes to the manufacturer’s engine requirements and maintenance schedules it is best to refer to your car’s owners manual. At Morris Autos Radiator we won’t just slap a sticker in your window telling you to come back in 3,000 miles. Our personalized recommendation will be determined based upon the age of your car, the manufacturer’s recommended change interval and the type of oil you are using. Check out our recommend service schedule here.