better to leave the valve open or shut it off in between smogs? does it make a difference?
I close mine for sure.
The techs that comes by to do repairs also close them too. Over $60 a bottle so every drop counts haha
after the screen where you revise all vehicle info before the ASM i close the bottle . open before you hit smog screen
open and close it after every bar97 test! Never leave open, it will leak big time or small time.
Never shut it off, except for weekends.
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