Remove all spark plugs lay them in same order and take and post pic. This will show how bad oil drinking.

 

Hello, i dint have the tools needed to do that atm, but since i changed my spark plugs around 2k miles ago when i bought the car i dont think they will be somekinda affected. I have my old ones though, i dont have any records on when it was changed last time, but when i remowed them, tips of the sparkpluga was covered with smth like a black tar. Not all sparkplugs, like 3 of them. So that means my postons rings are bad? As i mentioned, i burned around 2 quarts in around 1,6k miles.


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Same engine and same symptoms as me. As the months get colder, I see a lot of white smoke from my tailpipes whilst at traffic lights. Sometimes embarrassingly so.

I used to see smoke in the warmer months too, but after fitting the 02 pilot vacuum tube mod (maybe read into this – but it isn’t an ultimate solution) it drastically improved.


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Hey! Did i get that right? You did o2 pilot mod and the oil consumption increased? I called my local bmw mechanic and he told me that i need to replace my ccv, and clean or replace those plastic hoses.
I considered doing o2 pilot mod but i guess ill wait till i get that system cleaned or replaced. Update me on it goes with your case. Btw ehat is your oil consumption?


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I would do this in a 2 step process. First replace your CCV valve and associated hoses and see how your oil consumption changes. Second if the improvement is not enough than perform the 02 Pilot vacuum line addition. Doing it this way you will have a better way to measure your results

It is like having your car not be running well and than changing all kind of parts all at once, your car will run much better of course but you will have no way of knowing how each part you changed affected the outcome

 

Thanks for your replies! I will change my ccv and clean or replace ccv hoses. And ill see how this goes. I unplugged the hose comming from valve cover gasket and saw some milky oil in there. It appears when i drive a short distance when its cold outside. Should i be conserned about that?


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No post responders here on this have mentioned their odometer miles....Common, I have found for 'in-lines' at or around 100k is failure of the "Oil Filter Housing Gasket" A second concern at 100K is the CCV. A crank-case ventilation system...that by mechanical direction also gets burned out the tailpipe (via Catylitics). In America, cars imported, also including domestic, they too are required to meet USA standard emission requirement. Weather or not..and if you disagree...this is the law....

 

Thank you for response. I investigated my oil filter gasket and it looks ok, im willing to change my ccv to a new one, and look how much oil engine consumes then. If the problem remains (i hope it wont tho) i think im going to do 02 pilot mod. Mine has 136k miles on the clock.


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I don't think having major vacuum is a symptom of a bad CCV. I don't understand how the engine would automatically create more vacuum if the CCV was damaged when crankcase barely makes any vacuum to begin with.

If you had a broken CCV line anyway, you'd have a vacuum leak and less vacuum in the crankcase anyway.

Adding vacuum from the intake to the CCV is the only way to increase vacuum at the crankcase.

Replace your CCV, do the 02Pilot mod. Be sure to install a one way valve at the dipstick return.

 

Thank you for response. I ordered new CCV system today, and a one way valve. I hope changing ccv and doing o2pilot mod cures my oil eating...


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Replace your CCV. I don't know what the pilot mod is, but I'd suggest you don't do it, since nearly every mod has some unknown, often unwanted consequence.

I'm at 335,000 miles and maybe burn 2-3 qts. in my 12-15,000 mile oil change interval. Also, OP, use an LL-O1 oil

 

Monitoring Fuel Trims is a good way to determine how well the crankcase is sealed.

With the engine warm and idling, assuming the STFT are below +5%, remove the oil fill cap and the STFT should immediately jump by 20-22%. If there is very little change in the STFT then chances are the crackcase has one or more air leaks.

Suggest you get the CCV replaced, make sure the engine operating temperature is correct, then monitor the oil consumption before you do anything else.

 

Thank you for answers. As i mentioned i ordered new CCV and all hoses yesterday. I guess ill replace it and then check how much oil my engine “eats”. If it will still be lots of oil then ill do the o2pilot mod. Thank you all for advices and information.


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Hello!

So i changed my CCV a month ago and monitored my oil consumption almost every day. And i can say that changing CCV definetely helped. My E46 still burns a bit of oil, and as i heard from people its kinda normal. I guess i could do O2 mod, but i noticed that changing CCV increased vacuum in my valve cover, couse now when i try to remove my oil filling cap it is more difucult to do so, its being sucked a bit. Its nothing abnormal, i suppose couse it not really hard, it just barrely sucks the cap. SO i dont really know if increasing the vacuum even further doing that o2 mod would be really healthy to my engine.

It burns a lot less oil than it did before and i also found couple vacuum leaks while changing CCV. Im satisfied with my work results and ill keep checking the oil burning in my engine to overcome any other possible issues. I would say that changing CCV by yourself (especially if you havent done that before) is quite a job. It took me around 5 hours to do, and a lot of scratches on my hands. It looks like the M54 engine was made for people with tiny hands.

 

Confused





Hi Edvis, I just want to find out if the smoke stopped as well, also don't you find it weird that it increased the suction on the oil fillercap? People diagnosing a bad CVV all said this is the symptom of a failing CVV so im really confused lol, has there been a power increase feel?