So I have a 2014 Toyota Camry. I poured one bottle of Johnsen’s 4618 once into the reservoir. I replaced the radiator, and add another one bottle into the reservoir. The tube/ hose inside the reservoir expanded till the point it long enough to pop of the cap when driving on the road. I just have a quick look at the radiator cap, it seems the rubber does expand a little bit. Is Johnsen’s bottle the cause? And will may car come to an end of its life? what rubber may be damaged inside the engine? No overheating or anything problem yet