Intertune

What happens if I don’t change my oil?

Over time, the chemical structures in the oil break down and make it a less effective lubricant, according to McKenzie. And the oil is there to reduce friction, which causes heat. So if you leave your oil unchanged long enough, you’re asking for trouble and a hot engine. “This will at first make your vehicle run less efficiently, but eventually it will destroy your engine, effectively totaling your car,” McKenzie says. If left long enough, the entire engine will shut down, and you’ll have to replace it.
Those who do keep up with regular oil changes will reap the rewards for their car and wallet. According to Fix, keeping up with oil changes helps engines last longer and offers better fuel economy, too. Not changing your oil often enough is one way you’re shortening the life of your car.