I dont blame you, ...If you do get this sorted, you can then have an M56 valve cover MOD which makes it easier to remove and replace the CCV system with a russian membrane and a Paraklas CCV cover and get rid of the old system which is a pain to remove and replace....

Im keeping the Bave39 MOD as it has "cured" my oil consumption.

- This mod is about reducing INTERNAL oil consumption.

- It is NEVER intended to reduce EXTERNAL oil leak. Although it is a potential theory in things such as oil pan gasket or RMS leak, NOT proven yet.

My external leaks are miniscule. I don't have drips under the car. My usage is internal. If my usage was from external leaks I'd have a lot of oil under my car and I don't.

WELL i guess the pioneers of this MOD in 2015 have either moved on or their cars have imploded lol .

WE are all thats left ...will keep the MOD as it has been effective for me and as for my oil leak? its coming from the oil level sensor....
good day everyone..

The pioneer of this mod, Cn90 is still around and reports the mod is still working well for him. I recently put the mod in my truck about 5000 miles ago. I'm still using oil. Truck hasn't imploded. Still a very small leak at the oil pan. Replaced the OFHG and fixed that very small leak.

I added a catch can to the mod and it collects oil, so it looks to me like if I had done this mod without the catch can I would have been dumping oil into the intake. That would have been bad.

I have a theory that the people that did this mod and had it worked had lower mileage engines than I did. I had 250,000 mile on it before I did the mod.

Hey Fifty - I should say you and CN 90 are one of the few pioneers of this MOD left.Thank you for the input.
I was asking for more input from the rest esp.Bave39, I am getting ready to switch my E46 with the regular CCV and my E53 with an O2 pilot MOD to this MOD altogether...another E46 will stay as an M56 as is...
I will pull my spark plugs and take a look if I've been burning oil in there from this MOD .
03 325Xi 165 k miles
04 325XIT 158 k miles
05 325IT 169k miles(M56)yes with the built in fuel pump

05 X5 3.0 155 k miles

Cheers.

My old e39 still going strong, over 200,000 miles. My son drives her now and loves the 5 speed. Hardly any oil usage. What a great little trick.

I must revive this thread upon new findings regarding the amount of vacuum the M54 pulls after this modification.

In latest SIB 110308 BMW states the amount of pressure/vacuum inside the M54 crankcase must be ~16 mBar (that is 0,48inHg). As measured while using the FRAM FV345 PCV valve, the vacuum is 12-15 inHg (or +500mBar). That is over 30x the limit the engine was designed for, this is insane!

And this amount of vacuum is at idle ! Please imagine what letting off throttle/decelerating at 3-4-5K RPMs will do to the level of vacuum :yikes:
This will no doubtly damage seals/orings inside and deprive the oil pump of oil, lowering oil pressure for brief moments on decelerations.

I have not met another engine in the world where upon opening the oil cap that much vacuum is present. This is wrong and must be addressed as this modification transforms a Closed Crankcase Ventilation system into a Positive Crankcase Ventilation system, but without all the elements needed for such a PCV system to work.

Inside classic PCV systems/engines, there is a continuous air circulation inside the crankcase because there are 2 holes letting the crankcase breath: first one lets the blowby exit being sucked by the intake through the PCV and the 2nd one lets fresh filtered air inside the crankcase in order to: 1) limit the amount of vacuum being built 2) properly vent all areas of crankcase in a wide range of engine RPMs
Usually this 2nd hole sucks air from the intake downstream (after) of filter/MAF/MAP but before (upstream) throttle - where the vacuum is low when throttle is closed.

By removing the CCV (OK), plugging the dipstick drain hole (not OK) and rerouting the crankcase blowby venting directly into the intake (OK) you have designed an incomplete PCV system. One has to allow the block/crankcase to be vented with fresh air from a clean source otherwise it would be like sucking air from a plastic bottle: something/somewhere will colapse and those will be either your VCG or rear main seal.

By venting the block through a 2nd hole you are punching a hole in that plastic bottle you are sucking air out of: while the sucking is still there, the bottle will not collapse anymore as some small venting/air is let in keeping it vented.

If this worked for some of you it does not mean is a right thing, the engine was not designed for this amount of vacuum - and this is BMW's statement as you can see.

You need to provide clean measured source of air to the crankcase while using the PCV. This can be easily done through the vacuum F connector in the intake boot with a T connected to the dipstick previously plugged while a check (one way) valve is installed to prevent air/pressure from the crankcase going up to the intake.

Thank you Xelo for your input.
I know you have doubts about this MOD since 2019 (post #253,) did you actually do the MOD and the corrections you suggested, what were the results if you dont mind sharing?
and would you change to the PCV1124DL before measuring the vacuum. We dont use the FRAM 345.
And if indeed there is a a reduction in vacuum, would connecting the F connector to one of the rear unused ports at the back of the intake manifold be as effective?(this is the port that is used by the O2 Pilot Mod)
thank you

I'm 10K miles in.

Oil consumption went from a quart every 800ish miles to a quart every 3500ish miles.

I have 180K miles on my engine. No major leaks. RMS and oil pan has tiny amount of sweat, but has since I've owned the car at 134K miles.

Doc, do you ever throw an SES for high STFTs?

Here's what is occurring for me ever since I performed the mod:

https://youtu.be/LBC6gBnxTRY