Is there anyplace that sells an expansion tank cap that is a lower pressure than the black 75 Kpa ( 11 psi or whatever that works out to? ) caps ?
I'm looking for something in the 7 psi or less range. I'm going to try some of the Evans waterless coolant in one of my diesels ( '86 740 standard volvo cap )and that stuff doesn't need to be pressurized except enough to keep surges in.

Thanks--------
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '82 Mercedes 300SD for sale