Does anyone know if the stock 21p.s.i radiator cap can be replaced with a cap with about 14-18 p.s.i. the plastic o-ring type radiator seems to blow the o ring out every 45,000 Im on my 3rd one from the dealer 335.00 .does not have a blown head gasket nor does it over heat ,compression even through all cylinders.I think the problem is the high pressures the radiator is under,so I would like to drop the cap pressure,does anyone know if it will cause any problems.