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Engine oil change intervals: rule of thumb

The usual numbers run like this: mineral oil ≈ 5,000 km, semi-synthetic ≈ 10,000 km, and full synthetic ≈ 15,000 km. A few manufacturers push synthetic out to 20,000–30,000 km, so check the owner's manual before you trust any rule. Mileage isn't the whole story, though. Oil breaks down with time too, since the additives oxidize whether you drive or not, so change it every 6–12 months even when the car has barely moved. Example: a car at 45,000 km running synthetic, last changed at 35,000 km, is due again at 50,000 km. Check the level once a month and top up between changes when it drops. Synthetic holds up better in extreme cold, down to roughly -30 °C, and at high engine temperatures, around 140 °C oil temperature under heavy use.

Applications

Handy for mapping out preventive maintenance, keeping the manufacturer warranty valid since the manual sets the terms, lining up shop visits across product lines like Mobil, Castrol and Shell, and picking an oil grade that fits how and where you drive.

FAQ

What if I drive very little? Oil ages even when it sits. Change it once a year no matter how few km you put on.

Can I mix mineral and synthetic? In a pinch, topping up with the same viscosity grade won't hurt. But a full change should stick to one type, whatever the manual specifies.

Is the oil filter changed every time? Yes. Swap the filter whenever you change the oil. It's cheap and it keeps the engine clean.