Today plastic fitting of the upper radiator hose on my 2009 535xi (N54) disintegrated so I had to replace that. Last year I removed a hose from the cylinder head on that car and the mickey mouse style fitting disintegrated and left pieces in the head. When I replaced the hard coolant pipes on my 325i E46 last year they also broke off in the head. I wish they could have found a plastic that could stand up to time better. Still using the original rad hoses on my E46 and they look/feel fantastic still.