Not true my e34 has one.

 

Parthos,
8 months back I performed the PCV delete and a catch can. Everything seemed good although I seemed to be using more oil. I then installed a turbo back catless exhaust a few months later. Shortly after installing the exhaust I started noticing that when the car was at idle for more than 20 seconds or so blue smoke (oil smoke) would come from the tail pipe, just a bit at first but after 45 seconds or so I had a nice cloud coming from my car. It never ran different just smoke. I then started looking up possible causes for this. I found that the turbo shaft seals on these and all cars are only designed for holding air pressure out of the oil passage not oil in the turbo so to speak. The turbo oil feed and exit are sealed in the crank case. If there is any pressure in the crank case exceeding the pressure in the exhaust or compressor side oil will leak. I then reinstalled the PCV tube on the intake side with a catch can on both. The smoke in the exhaust was gone completely and oil consumption went back to where it was before the PCV delete. It appeared that the CAT converter was stripping/burning off the extra oil thus no smoke. I know the idea of eliminating the PCV (oil in the intake) sounds like a good idea but I think it is causing more problems long term to other parts. My theory is that the PCV valves in the cover have a cracking pressure of .5 PSI according to the bently manual which would be higher pressure than the pressure in the exhaust/intake creating a leak. Sorry for the long post and possibly the incorrect location.

 

Nice post with some observations. On the 2012 the real PCV is not in the intake side hose that you put the OCC on. All that changes is the length of the line if you add the OCC theatricality. I still don't know if this is related to oil consumption?

 

My post was more intended for those of us who had tried to mitigate the oil consumption/carbon build up with the PCV delete modification.

 

I am still interested.

 

I moved my discussion on the PCV topic to a new post so this one could keep on topic. (My first post every by the way)
If you would like to discuss my findings hop over here..
https://www.northamericanmotoring.co...ml#post3524905

 

Yep I replied to you there.

 

Glad I found this thread - I thought I was NUTS. I cannot read the dipstick either. I check the oil in our 2008 Clubman every time I fill it (wife and I share) so at least every 1kmiles. It Always looks fine yet, invariably, I will be out driving and having fun and at some point I will brake hard while doing downhill and the oil warning comes up- sure 'nuf 2 quarts low.

BTW - other cars: 99 Boxster - 93 k miles - change oil once a year (6500-8000 miles) haven't had to add oil between changes since it hit 25k miles.
Same - Cayenne 2008 - never needs oil (8-10k between changes).

Of course, I freak when I realize the oil is down more than a little.

Thanks for the tip on the dipstick! AND the PCV delete info.

 

Really? Both of mine do. I'd argue just the opposite - the newer, junky ones don't have them, while the "real" ones had them. Back in the day.

 

Oil light doesn't mean low oil, it means NO oil as is thd pump sucked up air...

 

Just a tip especially when oil is clean and hardly visible on the stock dipstick, is to use a paper towel and after wiping and reinserting the dipstick carefully fold a clean section of the paper towel over the end and see the oil level show up on the paper towel and without moving the stick you can see where the level is according to the end of the stick... If your oil is dirty enough to show up it needs changed most likely on the stock stick...

$.02

 

Just make sure that you don't have extra oil on the stick from the tube when you do that. I can see the oil on the stick OK when the oil is clean but getting a good indication of the level is more difficult because the tube has oil in it most of the time. You have to clear the tube before you can get a measurement.