Guys, my X5 isn't some wannabe pimp ride, its my daily driver, and is well used for its intended purposes. Its got 184K on it, is parked outside, and the headlights are sandblasted opaque from normal use. It pulls a 20 ft. race car trailer, and hauls a crapload of band gear. I could give a crap what the overflow hose looks like, as long as it WORKS and doesn't disintegrate when I use NORMAL anti-freeze in it (that works with EVERY OTHER auto manufacturer's aluminum engines and cooling systems). I also don't care if there's some chemical reaction, as if there is, its likely better than the OEM part which DISINTEGRATES with predictability when used as designed! Did you notice that the cam cover paint is flaking off the heads from its many temp cycles?