On my 300d the steel cooler line from the tranny to the front of the car cracked while on the highway. My quick and dirty fix was to splice a piece of rubber fuel hose with clamps in it's place. Worked fine, still not leaking. MB wants almost $300.00 for the steel line, have not found it here at Fastlane but also not called in to check. Does anyone know if the fix I came up with is ok, or am I looking at failure very soon and should I replace this line? Saw the leak before any damage to the tranny, looked like a fogging machine when it broke. Since I carry extra fluids, hose, etc was able to fix on the side of the road.