1. Engine damage: Diesel engines are designed to run on diesel fuel, which has a higher cetane number and lower volatility than petrol. When petrol is used in a diesel engine, it can cause knocking, engine overheating, and even engine failure.
2. Fuel system damage: Petrol contains more corrosive sulfur than diesel, so when petrol is mixed in with diesel can accelerate the breakdown of the fuel system components like rubber seals, injector pump, etc.
3. Poor performance: Petrol has a lower energy density than diesel, so using petrol in a diesel car will mean the fuel injection into the cylinders of the diesel engine with petrol mixed. As diesel engines have high compressions ratio which may further cause knocking sound on the engine and lower the performance too.
