The valve must be stuck. My engine has some high pressure at start-up. I blew 2 Volvo oil coolers when I fired it up, but it is normal when the 20w50 warms up. I went to a full synthetic 20w50 after break-in and it flows much better at start-up.
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NO_H2O
72 1302 Smack Black GL
73 Bus (2L CIS Powered)
66 Beetle, 73 Standard Beetle
72 Pinzgauer 710M
Volksport Kafer Gruppe
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