How much petrol to diesel,
Not a good idea, running it at all, a friend of mine did it, maybe 5 litre of petrol, but then filled it up with diesel, then run it dry.
Thought he had got away with it, a month later there was a pool of oil on the drive from the turbo.
may or may have not been related, but i would imagine the raised exhaust temp from the petrol could have blown the turbo seals.