Do you change your oil every 3,000 miles? The majority of drivers on the road have been bombarded by advertising that recommends changing their car's oil every 3,000 miles, but the truth is that interval is no longer really necessary. Yes, engine oil does get dirty, and when that happens, it can clog engine parts, but if you’re driving a car that’s less than five years old, you’re probably wasting money — and oil — if you change it as frequently as that. Yes, knowing when to change oil is not as...