just as soon stick with my 7 lb cap and 50/50 anti aluminum oxidizing antifreeze in my truck with the AL intake and radiator. my buick has original radidator and cast irun intake, so i am thinking the least amt of pressure that thing has to hold the better. hopefully by the time i am driving it again i will have the HOT lite working. haha, or else Old Faithful will let me know about it! 1.3 bar. yuk! 1 bar is good enuf for me!