My X5 E70 which was only 4 months out of its 3 year warranty and which only has traveled 58,500 kms was recently parked outside. We had a full day of heavy continuous rain, mindful though there was no flooding caused by the rain. Anyway I went to start the car and was unable to even access the car. Tried all keys and eventually gave up. The following day the car started, I didn't drive it though. I took it the following day to the BMW dealership and explained it wouldn't start previously and then on the way to the dealership the car kept on stating it was about to immobilize itself, indicators kept stopping and starting along with a lot of flashing gadgets. BMW subsequently contacted me and advised that the water was unable to drain sufficiently from the sunroof drain tubes and water flooded into the tire recess and flooded the electrics; all of this was not readily visible. BMW have advised I need to deal with the issue through my insurance and seem unconcerned that an expensive supposedly well engineered car could have such a basic issue. I certainly would recommend not getting a sunroof and I will be looking at alternate car manufacturers