As you’re aware, the engine of your vehicle can get very hot from the thousands of small explosions taking place every minute; oil helps pull the heat away from the combustion chamber essentially preventing the engine from blowing up. As oil collects heat, varnish and carbons during the course of protecting and keeping the engine running smoothly, it eventually becomes less like liquid and more like sludge. No matter how good the oil is, eventually it degrades as the additives get used up. That’s when you should have your oil changed.
How often and what kind of oil should be used? It will depend on the type of oil you choose to use, what kind of car, and how often you drive. This is where your owner’s manual will come in handy. The old adage suggests every 3 months or 3,000 miles. The amount of mileage you drive is more important than the amount of time.