🛢️ Oil Warning Light: Stop Immediately

The oil warning light — usually a red oil can symbol — is one of only two or three warnings that mean stop the car immediately, regardless of where you are or how inconvenient it is. Driving with low oil pressure for even a few minutes can cause catastrophic, irreversible engine damage.

Oil level vs oil pressure — two different problems

Some cars have a separate low oil level warning (often amber, often shaped differently). This is less urgent — low level means top up before the next journey. Oil pressure (usually red) means the oil isn't circulating properly right now, which means engine components are running without lubrication.

Check the oil level first

1. Wait 5 minutes after switching off for oil to drain back into the sump.
2. Pull out the dipstick, wipe it clean, reinsert fully, pull it out again.
3. The oil level should be between the MIN and MAX marks. If it's below MIN, add oil in the correct grade for your engine (printed in the handbook and often on the oil filler cap).
4. Add oil slowly — 500ml at a time — and recheck. Overfilling is also damaging.
5. If the level is fine but the warning came on, the problem is pressure rather than quantity.

Causes of low oil pressure with adequate level

• Oil pump failure — the pump that circulates oil has failed or is worn
• Blocked oil passages or a blocked oil filter
• Oil too thin — wrong grade, or oil degraded and broken down
• Worn engine bearings — oil leaks past worn bearings, reducing system pressure
• Faulty oil pressure sensor — the least dangerous cause but needs confirming

After you've added oil

If the light goes out after topping up and doesn't return, you likely had a low level causing the warning. Monitor it closely and investigate where the oil went — consumption, a leak, or both.

If the light stays on even after topping up, or came on with adequate oil, don't restart the engine. The car needs a proper diagnosis before it moves.