Anyone else have problems with the BMW radiator hose clamps? I had a leak at the hose connection on the outlet side of the thermostat housing. The original BMW clamp was stripped (could not get it any tighter). I replace it with a new BMW clamp. After driving it around for awhile, I checked it again and it was still leaking. I tried to tighted it a little more and stripped the new clamp.

Do you guys use BMW clamps? I know there must be clamps that can get the hose on tighter. Where do you get good quality clamps - at a discount auto store like Autozone? Or at nicer hardware stores???