It's not gonna fix a leak but it may help high pressure seeping which is where I'm at right now. No leaks or coolant loss since I was beating it for a week. Losing about 5 psi will be easier on the weak spots in this system but will also bring the boiling point of the coolant down about 15 deg but I should still be good. If I find one easy enough I'm gonna try it and let y'all know what happens. Prob after the holidays so in the words of Hans Grubber..." Ho.......ho........ho."Changing the cap to a lower PSI is just gonna screw things up and is not gonna do anything in regards to leaks.