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I wrongly put 1liter diesel in petrol car and I drive 5 km.there is no problem at the moment.is there any problem in future.

Hi there, generally if you got that far, you should be out of the woods.
It is generally not too bad if a small amount of diesel gets into your fuel, the vehicle may smoke and miss a bit. But I wouldn't think 1 litre would be fairly diluted, and not pose a problem.