Whether OEM or after market the pump should be shielded from the exhaust manifold heat or it won't last if you do longer trips in the Summer. The shield BMW added to take care of this issue is an ugly Rube contraption but it works. Marshall, at Double 02 Salvage, is where I picked up a new one not too long ago. Used the washer pump to fill the radiator overflow pipe when driving back from Octoberfest in Monterey 2013 after relocating the pump & tank to a cooler in the passenger footwell so it could be refilled on the fly. Really didn't want to change a leaking water pump in a parking lot. It worked and averaged over 60 MPH for the 750 mile drive washing the windshield for a few seconds every 10 miles. The factory part makes it plug and play.