Wrong fuel recovery

Whatever went in, it comes out before the car is driven. That is the whole job, and it is what we have done since 2009.

Petrol in a diesel, and diesel in a petrol

Petrol in a diesel

The serious one. A diesel system is lubricated by its own fuel. Petrol is a solvent and thins that lubrication away, so running the engine pushes petrol through the high-pressure pump and injectors dry.

Drained before it is run, the outcome is almost always a clean system and a car that drives away.

Diesel in a petrol

Diesel will not burn properly in a spark-ignition engine. It fouls the plugs and injectors, so the car smokes white, loses power and cuts out.

Topping up with unleaded lowers the ratio on paper and removes nothing that has already coated the system.

Does the amount matter?

No amount of wrong fuel is safe to drive on. Petrol strips lubrication in a diesel at a few percent, so a splash is still contamination. You also cannot know the real ratio, and that guess is the gamble.

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