what happens if i put petrol in my diesel car

Short version: stop, step away from the key, and don’t start it—petrol is a terrible cologne for diesel injectors. Turning the engine over can shred the high-pressure fuel pump and injectors, turning a silly mistake into a four-figure AUD sob story. Get it towed, have the tank drained and lines flushed, and replace the fuel filter; caught early, you might escape with hundreds, not thousands. If you did drive it, expect potential pump/injector damage and a repair bill that’ll make your wallet hiss. Next time, double-check the bowser label and consider a misfuelling guard; cheaper than new injectors and a bruised ego.