Worked for arnold clark ford and had one. Mondeo 2.0 tdci which had petrol put in, no one owned up so the car was started and used until it stopped working. Tried draining, cleaning, refilling. No use.

In the end needed new injectors at a dealer cost of £2500!!!

I hope for his sake a drain and refill works, if not get it traded in!

Just don't come to me or any traders on here or he'll get a kick in the sacks!!

Good luck, let us know the outcome

tony