in general, i agree with Mechryn regarding aftermarket solutions to OE products (when people say always stick with OEM). I replaced my suspension on my M3 with all bilstein, and it was worlds better in all aspects - ride, handling, absorption, etc....

however, if you have all your hoses in a melt-like condition, you could be putting a bandaid on a larger problem. before saying the OEM parts are crap (if the parts were 100% to blame resulting in a mess, you'd probably hear a lot more people complaining on this site about them), there could be some other overheat issue or blockage in your oil passages.

what is the year, mileage and powertrain of your X5?