answer:I get my car serviced more or less when advised by the manufecturers schedule. Tune up and oil change. Sometimes I do it a little early if I will be travelling a far distance, or push it a little late, but no great variance. I know for a fact I once brought my car to get a tune up and the mechanic did nothing. Total rip off, I bet they never lifted the hood and I paid them and my car still had some problems. A month later I brought the car to another mechanic recommended to me, and he said all my car needed was a tune up. After he actually did the basic tune up my car was like new. I wouldn’t say I replace parts before they actually need to be replaced. It depends on the part though.