How to check your engine oil, and which oil to use
A two-minute check you can do yourself, and where to find the right oil for your car.
The two-minute check
- Park on level ground and switch the engine off. Wait a few minutes so the oil drains back into the sump.
- Pull the dipstick out and wipe it clean.
- Push it all the way back in, then pull it out again.
- Read where the oil film ends. It should sit between the two marks.
- The oil should look amber to dark brown and feel smooth. Milky or gritty oil needs a workshop's attention.
Low on oil?
Top up a little at a time with the grade your car calls for, rechecking as you go. Don't overfill. A car that keeps needing oil may be burning or leaking it, so get it checked.
Which oil?
The grade, such as 5W-30, is in your owner's manual. Using what the maker specifies matters, especially while the car is under warranty. If you don't have a manual, a workshop can look it up from the model and engine.
When to change it
Follow the service schedule. See How often should I service my car?. Oil also ages with time, not just distance.
Oil pressure light
If the red oil light comes on while driving, stop safely and switch off. See the oil pressure warning light.
Questions drivers ask
Can I mix different oils?
In an emergency a top-up is better than running low, but try to stay with the specified grade and have the oil changed properly soon.
How much does an oil change cost?
It varies by car and shop, so ask for a written quote. Our [local average prices](#tool-prices) show what drivers around Auckland usually pay.
Is synthetic oil worth it?
If your maker specifies it, use it. If not, ask the workshop what suits your car and how you drive.
Checked by AutoPlace editorial team. General information, not professional advice. Updated 15 October 2026.