Not worried about my AOS and because my 991 has ultra low mileage, I assume it works as it did the day it left the factory.
So I would expect to see ~15 inches of water column (according to the LN "AOS UNDERSTANDING THE PCV AND AOS SYSTEMS ON PORSCHE BOXSTER, CAYMAN, AND 911 MODELS" article.
I have the manometer but needed an oil cap with an attached fitting...
https://www.smugmug.com/gallery/n-kFbbDS
991 Oil Cap Mod for AOS Manometer Use
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911-Purist
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Alex
1995 911 Carrera (993) 6-speed manual.
2015 911 Carrera 4 GTS (991.1) 7-speed manual.
2017 Acura RDX Elite - daily driver.
BMW: 1986 R80 G/S PD, 1990 R100 GS, 2016 R1200 GSA LC and a 2003 Kawasaki KLR 650.
1995 911 Carrera (993) 6-speed manual.
2015 911 Carrera 4 GTS (991.1) 7-speed manual.
2017 Acura RDX Elite - daily driver.
BMW: 1986 R80 G/S PD, 1990 R100 GS, 2016 R1200 GSA LC and a 2003 Kawasaki KLR 650.