Fifty- sorry it didn't work out for u as it did for me.My concern is the high vacuum that runs with this MOD .I am not sure if it is detrimental to the engine and its seals .Some anecdotal reports on RMS stopped lealing cause of this MOD.
Hoping that my leak is an OFHG which I have not changed yet and not the oil pan nor RMS.
Have not added oil since the MOd and despite the small oil leak level is quarter above low.

I'm glad you and others have had success. I wish I had. Someone on here suggested that this mod would result in fewer oil leaks due to the extra vacuum pulling air in through places like the rear main seal. Could be, I don't know. I didn't/don't have a rear main seal leak. I just did an OFHG change this weekend and it was not a bad leak, just a seep that didn't make drips, but it didn't look like this mod had made any difference in that leak. I do have a small pan gasket leak and that hasn't seemed to change with this mod either. So :dunno:

Long-term report on 2006 X5 3.0i 6sp MT...

- Nov. 2016: 122K miles: oil consumption ---> 1qt/400 miles.

- Aug. 2020: 135K miles: oil consumption ---> nothing at 5K oil change interval.

FYI: if you remove the PCV valve and connect the hoses directly using a simple metal reducer, the crankcase vacuum will be excessive and you will hear a loud hissing vacuum noise (very scary sound), been there done that and posted in this thread. So far, I am very happy with this mod. This mod using the Duralast PCV valve definitely increases the vacuum to the "correct" amount.

I will remove the Duralast PCV valve for inspection and photo for the group soon.

In many cars, this kind of PCV valve *should be* replaced every ___ yr/miles.
Does anyone here know the proper interval for let's say Duralast generic PCV valve as in this mod?

@fifty150 try running with oil level at the low mark.

Curious why you think that might have an effect?

I would be curious why as well?

thanks Cn90 ,-about the PCV - i have no idea what the interval is but , if it was me i would replace it yearly cause its inexpensive and easy to access and RR.Are you still running same set up that uses the 2 ports on the manifold?
wonder if Bave39 still around....

@fifty -thank you for the input , hope you sort that oil consumption soon

Thanks doc so do I. I'm going to let it go a little longer and see what happens. If it keeps up my last ditch effort is to try the ERR treatment to ungunk/unstick the ring packs.

I'm pretty sure the marks on the dipstick are wrong (on mine anyway) and the oil level is far to high on the full mark, causing the crank to dip into the oil. It may have been done intentionally to create the vacuum break for the CCV system but results in too much splash on the cylinder walls and a lot more oil going up against the rear main seal. As far as the "Mod" goes. If you understand how the systems work you will realize how much luck is involved by having it work by just following the instructions in this thread about the "dynalast valve" .

The dynalast valve does not control anything about the "amount" of vacuum in this case. Using only the one port instead of both probably has more of an effect and points out even more about what is unknown by people following this blindly.

If mine continues with the results I've got I will probably put the stock CCV system back in it. No sense running a mod if it doesn't do anything.