How Often Should You Change Your Engine Oil?
There's no single correct answer here, since it depends on the oil type and how the car is actually driven, but the ranges are well established and worth knowing rather than just trusting a dashboard reminder blindly.
Typical intervals by oil type
Fully synthetic oil generally lasts 10,000 to 12,000 miles or around a year, whichever comes first. Semi-synthetic sits around 6,000 to 8,000 miles. Mineral oil, now rare on newer cars, needs changing every 3,000 to 5,000 miles. Your car's handbook gives the manufacturer's exact figure, and it's the one to follow over generic advice, since it accounts for your specific engine.
Why driving style changes the real interval
Manufacturer intervals usually assume reasonably normal driving. Short journeys, frequent stop-start traffic, towing, or a lot of cold starts all put more strain on oil than steady motorway miles, and most manufacturers publish a shorter "severe use" interval for exactly this reason. If most of your driving is short local trips, it's worth assuming the shorter interval applies to you.
Signs your oil is overdue regardless of mileage
- Oil that looks black and gritty rather than amber on the dipstick
- A louder or more noticeable engine note than usual
- The oil warning light, which means the situation is already serious, not an early warning
What happens if you leave it too long
Oil doesn't just lubricate, it also carries heat away and keeps contaminants suspended rather than settling on engine surfaces. Old oil loses this ability gradually, which accelerates wear long before anything fails outright. The cost of a routine oil change is small compared to the cost of the engine damage that neglecting it can eventually cause.
Check a car's MOT history to see if oil-related advisories have come up before.
Check MOT history