DIY Solution to M54-M52TU CCV problems

[imalabil]

In mulling this over I have a couple of questions before I take the plunge this weekend:

1. Oil will reduce the octane value of gasoline. This change will presumably put more oil vapor into the intake manifold. Has anyone noticed a tendency to ping/knock with this set-up?
2. I'm wondering if more oil combusted could foul 02 sensors or catalytic converters.

Of course, other cars use simple PVC systems and don't necessarily suffer these side-effects, but I thought I'd ask.

[axgordon]

Originally Posted by imalabil

In mulling this over I have a couple of questions before I take the plunge this weekend:

1. Oil will reduce the octane value of gasoline. This change will presumably put more oil vapor into the intake manifold. Has anyone noticed a tendency to ping/knock with this set-up?
2. I'm wondering if more oil combusted could foul 02 sensors or catalytic converters.

Of course, other cars use simple PVC systems and don't necessarily suffer these side-effects, but I thought I'd ask.

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.

[cn90]

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.

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.