So, a week before Christmas I finally bought myself an E60 530d M sport. I'd wanted one for a while, having been in little Japanese cars low to the floor I wanted to know what big powerful and lazy felt like. I was also doing a lot of motorway miles. But, it lasted a week before mother nature took that from me. I came upon a puddle (burst river banks as we later found out) and hesitated before crossing. At this time I was overtaken by a yaris and an RX8 who seemed to get through no problem. So I followed suit, about halfway in, the revs died and that was that. We pushed the car out of the water and got it recovered. To see what the damage was I stripped back the intake system and the intercooler which i'm pretty sure could have filled up a small bath or a large sink at this point. As this was at the side of the road I couldn't really go much further so I handed it over to a garage to do some deeper engine checks. I've had the phone call today to say the engine is beyond economic repair. Great. As much as it sounds like a sob story this is an opportunity for me to pass on what I learnt, the very expensive and hard way. - BMWs have very low air intakes, the only other car (out of a good 25) that died in this particular stretch of water was... another BMW. - If you have water in your intercooler; you're going to have a bad time. - When garages check to see if your car has been 'hydrolocked' they strip back the air system and do a compression test. You can do a lot of this yourself and it will save you a heap in labour. - When driving through deep water just try to keep it slow and steady, speed lifts the water up over the front. - Keep revs reasonably high to stop water getting in the exhaust - If the car does die in the water, do not try and start it immediately, this will probably just pump water further round the intake system and probably into your engine. This may seem obvious to many and I knew most of it and still got caught out but I assume a lot of drivers on here do not. I'm assuming some abuse will come my way as to why I drove into the puddle but when you're trying to get home on Christmas eve (and an RX8 can do it) it seemed pretty safe.