Quote:
Originally Posted by axgordon
Imalabil - I do not have clear answer why this mod greatly reduce oil consumption, however this is what many including my self observed. This is clear indication that less oil got burned causing less impact on the fuel octane and less stress for catalytic converters and O2 sensors. My experience based on less than 2500 miles. I will continue to monitor and report to the board.
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This happens because of the loop of the hose going UPWARD: oil goes down by gravity (not by separation as in the E53 stock CCV valve), and air gets sucked into the loop. So oil consumption is minimal.
Conceptually, this is similar to E23 (1983-1987 735i) with simply a hose slating upward as the CCV, talking about simplicity.