Review on Enhance Your Engine Efficiency with the MotoRad T-65 Radiator Cap by Brian Wolf

BMW X5 Radiator Cap should click when fully closed. This doesn't click, just tighten, which can result in the CAP being overtightened and potentially damaging the tank. I didn't want to return such a small item so here I just used a rubber o-ring to replace the o-ring on the cap I was replacing, keeping my original cap. What an expensive O-ring.