How to check your engine oil properly
A dipstick reading taken at the wrong moment is worse than no reading at all.
Cold, level, and patient
Check before the first start of the day, on level ground. Oil takes hours to drain fully back to the sump, and a reading taken shortly after driving will show low, which is how engines end up overfilled.
Reading an electronic gauge
Many recent cars have no dipstick. The dashboard reading is taken by a sensor in the sump and usually requires the engine to be idling at temperature for a set period. Follow the sequence in the handbook exactly, because a mid-cycle reading is meaningless.
What the colour tells you
Less than people think. Diesel oil goes black within a few hundred miles and is doing its job. What matters is the level, whether the oil feels gritty between two fingers, and whether it smells of fuel.
How often
Monthly for a car under warranty with documented low consumption, and every couple of fuel stops for anything older, higher mileage or known to use oil.
A registration lookup returns the grade, approval code, capacity and interval for your exact engine — free, and without a sign-up.
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