How far can you drive with petrol in a diesel car?
There is no fixed distance a diesel can run on petrol. Whatever the amount and whatever the engine, switch off and get it drained.
There is no fixed distance a diesel can run on petrol. One vehicle might run for several kilometres before stalling, while another shows signs of fuel system strain almost immediately.
Why outcomes vary
How an engine reacts depends on its design and how hard it was driven, so no two jobs play out the same. The advice doesn't change with it. Whatever the amount and whatever the engine, switch off and get it drained. There's no engine and no amount we'll call safe to run on the wrong fuel.
What happens as you drive
The engine may start running roughly, followed by loud knocking as delayed ignition causes fuel to detonate late in the cylinder. Many vehicles will stall as the fuel system struggles to operate.
Damage occurs before the engine stalls. Modern high pressure pumps rely on diesel for lubrication. Petrol strips this away, allowing metal components to rub together and shed fine debris into the injectors. Once debris moves through the lines, a roadside drain alone may not solve the issue, and workshop repairs could be required. The full maths is on what wrong fuel damage actually costs.
Handling the situation
- Engine not started: a straightforward kerbside drain gets the car back on the road quickly.
- Engine driven: we drain the fuel system on site and assess how the engine runs once clean fuel is through.
The key rule
Distance is not the main factor. Whether you turned the key is what matters. If you put the wrong fuel in, do not start the engine. If you are already driving, pull over safely and call us on (08) 7083 9699. We are available 24 hours across metro Adelaide and come directly to you. If you are still not sure whether you have misfuelled, the signs are here.
