Diesel In Unleaded Car:
That sinking feeling. You’ve just finished filling up, you hang the nozzle back on the pump, and then you see it – the black, greasy handle of the diesel pump in your hand, when your car takes green unleaded. It’s a common mistake, but what you do in the next few minutes is absolutely critical.
Getting it wrong can be the difference between a simple fix and a four-figure repair bill. But don’t panic. The golden rule, the one thing you must remember above all else, is this: do not start the engine. Seriously. Don’t even turn the key to listen to the radio.
Right, you’ve realised the mistake. Before you do anything else, take a deep breath. Your car is still fine. As long as the diesel is just sitting in the tank, it's a containable problem. The real damage starts the second you turn that key.
Lots of Exhaust Smoke:
One of the most glaring signs is thick smoke pouring out of your exhaust. It’s usually white or grey as the engine struggles, and fails, to burn the oily diesel.
Engine Juddering or Misfiring:
The car might feel like it’s bunny-hopping or shaking violently, especially when you try to accelerate. This is the sound and feel of incomplete combustion.
A Loud Knocking Sound:
You might hear a very distinct knocking or rattling noise, often called "pinking," coming from the engine. That’s the engine telling you it's under serious strain.
Loss of Power: Your car will feel incredibly sluggish and weak.
