Too much petrol in diesel WILL cause engine damage.Diesel ignites under compression,petrol by ignition (spark) most petrol engines operate at compession ratios between 9-1 and 11-1,except certain modified race engines (high compression) which use very high octane petrol in order to control detonation,and high boost turbo engines (low compression).Diesel engines operate at compression ratios almost double that of petrol engines,having petrol in the diesel will lead to "pre ignition/detonation" which will damage piston heads,valve seats,cylinder chambers etc etc, (I spent many years machining,bu