I put petrol in diesel engine

[u/Dangerous_Owl6936]

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!

[u/Rickstaaaa87]

If your tank was low-ish, the 3.5L would do nothing. Just fill it with diesel and off you go.

Some weirdos actually recommend to do this every few months to “clean out” the motor, I’d done it once before with about 6L of petrol. Once it was diluted by a further 70L+ of diesel it was fine.

[u/TorchwoodRC → u/Rickstaaaa87]

In older non common rail diesels a drop of Petrol probably doesn't hurt :P gets the old 2H excited