'15 LR4 and either through routine maintenance or necessity because it blew, I honestly can't think of any other coolant related hose that hasn't been replaced. The latest and I believe last (even according to my dealer) is this one. The hard ABS plastic section between the two large silicone hoses cracked horizontally and has created a slow leak. It's baffled me and the dealer for some time as it wasn't a more "visible" hose/leak and the leaking wasn't instantly happening. If I let the truck sit overnight sometimes there wouldn't be any leak. I suspect it might have been pooling on the inside of the skid plate, but I'm not sure on that one. Well, at least that one is solved.