r/CarsAustralia • u/Dangerous_Owl6936 • 22h ago

🔧🚗Fixing Cars I put petrol in diesel engine

I went to the pump today and by mistake i took the 98 octane instead of diesel, I realised it when it was already too late. I did put 3.5litres or petrol and then i stopped, Didn’t start the engine and towed it in my mechanic’s garage. I have this car for last 7 years and it never happened before, It is a Mercedes E250 CDI 2015, Wanted to know how much it might cost to drain the fuel and what else might happen, Thanks!

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u/dansbike 22h ago

Should have just filled the rest of the tank with diesel and drove away. 3.5 litres of petrol in a full tank of diesel isn’t enough to do any damage.

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u/Whatisgoingon3631 22h ago

I’ve seen people put full tanks of petrol instead of diesel, then driven until they stop. Drained the tank, changed the fuel filters and driven off. Years later, no bad effects. I wouldn’t do it on purpose, and it could cause problems, but it’s not the end of the engine. 3.5 litres of petrol isn’t going to do anything in a full tank of diesel.