you must use BMW bulbs, the aftermarket Sylvanias or whatever melt the socket and/or housings. I went through 2 sets of taillamps before i realized this. If you have an Autozone near you, the part number is NOT 1157, those are the ones that melt them. I believe the correct one is like 3001 or 3007, those are Sylvania part numbers. Or go to the dealer and buy the correct ones.