OK, if radiator-cap pressure is say 20-pounds as opposed to 18-pounds, won't the overall impact on the engine and cooling-system be more heat/pressure stress???
Sure, the boiling-point will be raised with the higher pressure cap....but so will the pressure in the cooling-system. Also, the engine and cooling-system will be exposed to higher temperatures, with the higher pressure cap, even if that coolant is not boiling......that is still heat the engine and cooling-system have to "tolerate"?????
Doesn't the action of the radiator-cap opening, to release hot-coolant, act as a way to not just get rid of pressure, but also some heat......and isn't this earlier "relief-point" easier on your engine and cooling-system?????
Someone help me here!!!!!!!!!!!!!!