How Often Should You Change Your Engine Oil?
By Unbroken
For most cars, change the engine oil every 10,000 to 15,000 km (6,000 to 9,000 miles) or once a year, whichever comes first. Full-synthetic oil can often go longer, while short city trips, dust, towing, or extreme cold wear it out faster. Always confirm the interval in your owner's manual.
Engine oil lubricates, cools, cleans, and protects the moving parts inside your engine. Over time it breaks down, collects contaminants, and loses its lubricating ability, so changing it on schedule prevents accelerated wear and costly failures. Modern engines with tighter tolerances and turbochargers are especially sensitive to old, degraded oil, which is one reason many manufacturers now specify full-synthetic oil from the factory.
How do you know it is time?
Common signs: the oil-pressure or oil-change warning light comes on, the dipstick shows very dark or gritty oil, engine noise grows, or you have simply passed the recommended interval. Driving conditions shift the timing too — hot climates, dusty roads, heavy loads, towing, or lots of short trips all shorten oil life. When in doubt, change it early rather than late; fresh oil is far cheaper than a rebuilt engine.
- Is synthetic oil worth the extra cost? +
- Usually yes. Synthetic oil keeps its protective properties longer and copes far better with extreme heat and cold, which allows longer change intervals. Many newer cars require a synthetic grade from the manufacturer, so check your owner's manual before switching to a cheaper conventional oil.
- What happens if you change it late? +
- The oil turns thick, dark, and dirty, lubrication suffers, and internal wear increases. Sludge can also build up and block oil passages. A significant delay shortens engine life and can cause expensive failures, so treat the interval as a limit rather than a loose suggestion.