Just back from a couple of hours on the road where I noted these pressures at 180 degrees F
idle 13 psi
2600 rpm - 50 psi
This on an untouched engine (as far as I know) with just under 100,000 miles on it.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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