[turbs]

I cant see any logical way it can use more oil after intake cleaning or before for that matter. The intake is just a tract, there are no oil ways etc. It could possibly cause a build up of pressure, but serious doubt it. I would not bank on it ever being that.

Compression and leak down test is your answer mate. That will tell a whole world of things it could be. Why your Chasing these random issues instead of carrying out a standard, very cheap procedure I really don't know.

[335coupepr]

Originally Posted by JunkStory

I have heard from two independent members that their oil consumption has been alleviated after cleaning the intake valves. Yes, it is possible that gunked up intake can lead to oil consumption, but don't ask me why..

I am in the same exact situation. My car has about 80k miles, and burning about 1qt of oil ever 300 miles (maybe even less than that). I will try to clean the intake and see where that goes.

Let me know the results.

[335coupepr]

Originally Posted by turbs

I cant see any logical way it can use more oil after intake cleaning or before for that matter. The intake is just a tract, there are no oil ways etc. It could possibly cause a build up of pressure, but serious doubt it. I would not bank on it ever being that.

Compression and leak down test is your answer mate. That will tell a whole world of things it could be. Why your Chasing these random issues instead of carrying out a standard, very cheap procedure I really don't know.

I am taking the car back to the dealer under warranty, if they don't fix it, I am returning the car under lemon law. I will take the compression to see, but the car runs fine, no misfire, etc. How do you do a leak down test?

[007_e350]

Op, u need to look more deep
1- remove engine acoustic cover and look for oil leak into spark plug area etc (remove coils to see)
2- get under the car, remove steering rack and then remove Downpipes - If there's oil in the turbos they're the culprit - the turbo's oil seals are worn and they're burning oil in exhaust
3- remove vent hose from top next to PCV and look inside to see if diaphram ok, it should have a slit, if its torn or completely through it could be dumping excessive oil to intake
I'll think of more these were the 3 places I experienced oil leaks in my car, ever since resolved oil doesnt need to refil for 2500 miles (before was every 1000)

[335coupepr]

Thanks, I am goint to mesure the compresion. The other day while at wot, I saw a puff of white smoke coming out ot the exhaust, it only happen ones, at least the only time I saw it. I am thinking bad valve seals with all the GUNK on it. Thanks

[turbs]

If it puffs smoke its more than likely turbo seals. Dirty valves wont use that much oil.

[335coupepr]

Originally Posted by turbs

If it puffs smoke its more than likely turbo seals. Dirty valves wont use that much oil.

Turbos were replace few month ago, who knows

[JunkStory]

Originally Posted by turbs

I cant see any logical way it can use more oil after intake cleaning or before for that matter. The intake is just a tract, there are no oil ways etc. It could possibly cause a build up of pressure, but serious doubt it. I would not bank on it ever being that.

Compression and leak down test is your answer mate. That will tell a whole world of things it could be. Why your Chasing these random issues instead of carrying out a standard, very cheap procedure I really don't know.

Then I'm out of ideas. There's absolutely no leak anywhere.

Oil housing is dry.
Oil pan underneath is dry.
Pulled the downpipe, it's dry.
Installed Oil Catch Can, checked after 4000 miles. Bone dry.

Where the f*ck are my quarts after quarts of engine oil going............ I'm already using thicker 0w-40 castrol syntec. If not for this issue I would be keeping this car for as long as I could. But at this rate I might as well look for a gas station that has an engine oil pump right next to the gasoline pump. 1qt of oil every 300 miles, 2007 N54 with 80k miles, zero mods.

Someone help us please.

[332ijunkie]

Into the coolant?. Dont see HG issues on N54s but a shot in the dark...

[JunkStory]

Coolant quality is good. I just changed the water pump, therefore replaced and inspected the coolant there is no oil inside.

[335coupepr]

[QUOTE=335coupepr;16098816]Turbos were replace few month ago, who knows[/QUOTErbos
Guess what,my new turbos are bad. Call this guy, they call him "BURU",over 20 years working in BMW and Porche, I explain to him about my oil consumption and all new parts, right away he said the turbo seal. I told him that the BMW Dealer replace them a few month ago. He says those turbos are Remanufactured and not good, he has send back many clients back to them to rechange the turbos. Last night a friend of mine fallow me, and my car is smoking like crazy at wot, I did not see that. This week It suck 1.5 quarter of oil after 200 miles. Since I checked the intercooler and there is no oil, the exhaust turbo seals are the ones blown. Now, I have to go to him, get a certification and take the car back to the BMW dealer and replace the turbos. I spent month looking for the problem, never look at the turbos because they were new. He also mention that the 335i barely or never will give you any problem with piston rings and valve seals, like many people mention in this post. The bad apple for this car are the turbos.

[335coupepr]

Originally Posted by 007_e350

Op, u need to look more deep
1- remove engine acoustic cover and look for oil leak into spark plug area etc (remove coils to see)
2- get under the car, remove steering rack and then remove Downpipes - If there's oil in the turbos they're the culprit - the turbo's oil seals are worn and they're burning oil in exhaust
3- remove vent hose from top next to PCV and look inside to see if diaphram ok, it should have a slit, if its torn or completely through it could be dumping excessive oil to intake
I'll think of more these were the 3 places I experienced oil leaks in my car, ever since resolved oil doesnt need to refil for 2500 miles (before was every 1000)

Turbo seals are the answer, even do the turbos were replace a few month ago, BMW dealer are replacing Remanufactured turbos. Everthing else is replace and check.

[335coupepr]

Originally Posted by turbs

If it puffs smoke its more than likely turbo seals. Dirty valves wont use that much oil.

YOU WRE RIGHT, SEALS ARE BAD EVEN DO THE TURBOS ARE NEW, BMW DEALER ARE REPLACING THE TURBOS WITH Remanufactured ONES.

[335coupepr]

Originally Posted by JunkStory

Then I'm out of ideas. There's absolutely no leak anywhere.

Oil housing is dry.
Oil pan underneath is dry.
Pulled the downpipe, it's dry.
Installed Oil Catch Can, checked after 4000 miles. Bone dry.

Where the f*ck are my quarts after quarts of engine oil going............ I'm already using thicker 0w-40 castrol syntec. If not for this issue I would be keeping this car for as long as I could. But at this rate I might as well look for a gas station that has an engine oil pump right next to the gasoline s. 1qtsf oil every 300 miles, 2007 N54 with 80k miles, zero mods.

Someone help us please.

Have you have a friend fallow you to see if you car smoke at wot?, do it at night, better to see white smoke. Also, look at your tail pipes tips, are they full of carbon deposit. Second, take you intercooler out to see if you have any oil inside, could be your turbo cold side seals. The intercooler is super easy to take off. And like everyone else say, last, check the compression. I let you know about my results.

[JunkStory]

Originally Posted by 335coupepr

Have you have a friend fallow you to see if you car smoke at wot?, do it at night, better to see white smoke. Also, look at your tail pipes tips, are they full of carbon deposit. Second, take you intercooler out to see if you have any oil inside, could be your turbo cold side seals. The intercooler is super easy to take off. And like everyone else say, last, check the compression. I let you know about my results.

Can I go WOT in neutral? The tail pipes are indeed walled with black carbon.

Keep us updated. To be honest I rather top up engine oil than replace the turbos which is a $4k+ job (no warranty)

[335coupepr]

Originally Posted by JunkStory

Can I go WOT in neutral? The tail pipes are indeed walled with black carbon.

Keep us updated. To be honest I rather top up engine oil than replace the turbos which is a $4k+ job (no warranty)

I belived there is a recall for the turbos, go to a BMW dealer and complaint about the wastegates sound and they change the turbos for free. Mine is going back for second time, my frien also did that. Also, I know a person that sell old turbos, (both of them for $150). If you can not change it at the BMW shop, I gave you the persons e-mail (from ebay) and you could get a pair and get them fix (new seals, etc)at any turbo shop. Going wot in neutral is not the same, you have to ride the car and make some boost, have some one fallow you and tell you if you car smoke, also take down the intercooler, is easy and look for any oil inside.