After a lot of reading in overseas forums as well as talking to various X5 owners here, here are some of the more common failures in our otherwise excellent car. These are exclusive to the X5. Other common failures from the engine and gearbox, electricals are inherently a BMW problem and not confined to X5. Feel free to add. 1) Air springs. If you have just rear air springs, count yourself lucky. If you have both the front and rear then double your woes. However, Ebay is your friend. 2) Side mirrors unable to fold. Damaged worm gear in the motor. Sifu Jarance is probably the only guy in Malaysia to be able to fix this. Believe me, I've asked around. 3) Outside door handle unable to open. Caused by broken door handle carriage. Again, parts available cheaper on Ebay.4) Power windows unable to wind up or down. caused by broken clips or cable inside the window mechanism. Individual spares available on Ebay or buy a repair kit. 5) Transfer Case Chain. The symptoms are you hear a very loud popping sound or 2 when you accelerate hard from standstill. If you accelerate normally it doesn't happen. This is caused by the transfer case chain lengthening through time and causing it to skip/jump under load. Buy direct from the transfer case manufacturer for a fraction of the price compared to here. I've got No 2, 3 and 5 of the above problems already. Standing by with the parts for 1 and 4 which will eventually happen.