How Often Should You Change Your Oil?

“Every 5,000 km,” people often say. But that rule dates back to the era of mineral oils. With modern oils and recent engines, the real interval is often much longer. Here's how to find the right frequency for your car.

What your manufacturer actually says

The ultimate reference is your owner's manual. Most recent vehicles recommend an oil change every 8,000 to 12,000 km, or once a year. Following the manufacturer's interval also protects your warranty.

Conventional or synthetic oil?

• Conventional oil: roughly every 5,000 km. Increasingly rare.
• Semi-synthetic oil: roughly every 7,500 km.
• Full synthetic oil: 10,000 to 15,000 km depending on the manufacturer.

Québec winter driving changes the math

Cold starts, short trips and stop-and-go traffic — typical of winter in Montréal or Québec City — count as “severe” driving. In those conditions, shorten the interval by 20 to 30%: the oil degrades faster.

Signs it's time for an oil change

• The maintenance or oil-pressure light comes on the dashboard.
• The oil on the dipstick is black, thick or smells burnt.
• The engine is noisier or runs rougher.
• You've passed the recommended interval or date.

Finding a garage for your oil change

An oil change is quick and affordable, but prices vary from garage to garage. On UnyCars, submit your request in two minutes and compare offers from garages in your area — without calling around.