When i was checking my engine bay oil, coolent etc, i took off the oil filler cap and put it on the top off the air filter box. I was distracted when the pretty girl who lives in the flat next to mine came over to talk to me. To cut a long story short i closed the bonnet and drove off without the oil filter in place. I went on a short drive (15 miles round trip) and thought i could smell oil so i parked up and lifted the bonnet and sure enough the oil filler cap was missing and probably dropped off somewhere on the road. There was no oil spilling out or anything and i have ordered another on from the dealer but i just wondered if it would have done any damage to the engine.