newer diesel engines should never ever see a drop of petrol.
If you do a searh there is laods of feeedback on this and since the increase in dieske engine cars this is a thriving industry.
Look for solo diesel they sell a cap that will prevent the petrol nozzle enetering the tank. I should know I put petrol in a 2.2d diesel but knew what to do, 1. dont start engine, 2, dont touch remote, some remotes tricp the fuel pump, 3, call aa, 4, get towed to garage, 5, syphon out all the furel. 6. fill to brim with diesel, 7. do a long run ie 20 miles. 8. relax problem fixed.
9. get a special cap.
noah
petrol in a modern diesel engine will RUIN the injectors = a major outlay, dont do it. The bit about petrol doing good is baloney.