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Old 07-20-2012, 07:50 PM   #7
Registered User
Join Date: Aug 2005
Location: Jacksonville,Fl
Posts: 325
My Ride: 2003 330i
Good question because I checked mine today on my 330. With the key in the on position it read 50psi. Then I started it and it read 50psi. Turned the engine off and it slowly dropped to 44psi and stayed there for at least 30min til I then took the gauge off. I don't know how long you should keep the gauge on though.
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