There is no single interval that fits every car. The right schedule depends on your engine, the type of oil it uses, and how you drive. This guide gives typical ranges, but your owner’s manual is the best source for your specific vehicle.
The short answer
Many modern cars call for an oil change somewhere between about 5,000 and 10,000 miles, or roughly once or twice a year, whichever comes first. Cars that use full synthetic oil are often at the longer end of that range, and some manufacturers specify longer intervals still. Cars driven in tough conditions may need changes sooner.
Start with your owner’s manual
The manufacturer’s recommended interval and oil specification are the most reliable guide for your engine. Many manuals list two schedules: a normal one and a severe-service one. If your car has an oil life monitor, the manual explains how to use it. Following the manual also helps keep warranty requirements in order.
Typical intervals by oil type
These are general ranges commonly quoted for each oil type. They are not a substitute for your manual.
| Oil type | Commonly quoted interval |
|---|---|
| Conventional | About 3,000 to 5,000 miles |
| Synthetic blend | About 5,000 to 7,500 miles |
| Full synthetic | About 7,500 to 10,000 miles, longer for some manufacturers |
Whatever the mileage, most sources suggest changing oil at least once a year. For more on the oil types themselves, see synthetic vs. conventional oil.
How often to change full synthetic oil
Full synthetic oil resists breakdown better than conventional oil, so it generally lasts longer. Typical guidance for normal driving is about 7,500 to 10,000 miles, and some manufacturers allow more under the right conditions. Some turbocharged or high-performance engines have shorter recommendations, so check what yours specifies.
Common questions:
- Can I go 10,000 miles on synthetic? Possibly, if your manual allows it and your driving is mostly normal. If you drive in severe conditions, shorter is safer.
- Can synthetic oil really last 20,000 miles? A few vehicles or oils are rated for very long intervals, but that is not typical, and you should not assume it applies to your car without confirmation in your manual or from the oil’s specification.
- Is 7,500 miles a good interval? For many cars on synthetic oil in normal use, it is within the commonly recommended range.
Is a year too long between oil changes?
Oil can degrade with time even if you do not drive much, because moisture and fuel can build up in it and its additives age. For that reason many manufacturers and shops recommend changing it at least once a year, and some manuals specify 6 or 12 months. Going two years or more without a change is generally not advised. If you drive very few miles each year, follow the time limit in your manual rather than the mileage.
Changing every 6 months is not harmful, but it may be more often than your car needs. It can make sense if you do a lot of short trips.
Driving conditions that call for earlier changes
Check your manual’s severe-service schedule if you often:
- Take short trips where the engine does not fully warm up
- Drive in stop-and-go traffic or idle for long periods
- Tow or haul heavy loads
- Drive in very hot, very cold, or dusty conditions
Oil life monitors
Many newer cars calculate oil life from how the engine is actually used and show a percentage or a message. Following that reminder is usually appropriate if your manual says so. If your car has no monitor, use the mileage and time limits in the manual. Oil is also one line item on the wider car maintenance schedule. Our guide to the signs you need an oil change can help you spot trouble between services.
Is the 3,000-mile rule still necessary?
For many modern engines using synthetic or synthetic-blend oil, 3,000 miles is shorter than the manufacturer asks for. It remains a reasonable habit for some older vehicles or those that use conventional oil under severe conditions, but check your manual before changing this often.
Related reading
- The oil filter change interval usually lines up with the oil change.
- For the basics of the service, see Oil Changes 101.