DIY Solution to M54-M52TU CCV problems

[80stech]

Something like a propane regulator would probably work nicely to regulate crankcase vacuum but on the fresh air side NOT on the vacuum side. The Wagner adjustable PCV valve in place of the 'magic' PCV valve listed in this thread is a better option as well. If memory serves, the E30 and others used full vacuum on the crankcase with only flow limited by an orifice. I think I have said most of this before but either way I'm done now.

[Bmwe5320023.0]

Valve cover pressure around 10 in Hg when vehicle is idling. Not a huge draw I think. Drove the vehicle for maybe 500km and the oil still dropped from full mark to min mark on the dipstick

[Fifty150hs]

Originally Posted by Bmwe5320023.0

Valve cover pressure around 10 in Hg when vehicle is idling. Not a huge draw I think. Drove the vehicle for maybe 500km and the oil still dropped from full mark to min mark on the dipstick

And that is why I put a catch can into the system. Oil is still getting pulled out of the crankcase. If the vapors go through a catch can you can return it to the crankcase. That said, from full to low in 500 km is a huge loss of oil. That's a liter. Even when I had a bad CCV and I was burning a lot of oil, the most I used was a liter in 600 miles. That was half your usage and I was getting smoke out of the tail pipe. With your kind of usage you should be too, or you should have a big puddle under your engine.

[Bmwe5320023.0]

Definitely nothing leaking, so I'm not sure where the oil went lol. I'm gonna test again to make sure.
I also ordered acdelco top engine cleaner, so maybe it will help with bad rings

[Bmwe5320023.0]

Alright one more update, made sure engine oil was at max and drove 500km.
Came back and checked again, and the level is full!
So I think this mode is working well. Will see how it holds over time.

[cn90]

Another update...

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

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

- July 2023: 143K miles: oil consumption ---> nothing at 5K oil change interval.

[Bmwe5320023.0]

Legendary!

Only 21k miles in 7 years??

[Fifty150hs]

Originally Posted by cn90

Another update...

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

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

- July 2023: 143K miles: oil consumption ---> nothing at 5K oil change interval.

What is your percentage of around town vs freeway driving? I find with the mod on my X consumption is very low when I've done mostly around town driving. When I have a higher percentage of highway driving the consumption goes up to as much as a quart every 5000 miles. Still better than the quart every 600 I was getting before the mod. BMW says that higher oil consumption is to be expected with more highway driving.