Blue Smoke from Exhaust

[A B Able Truck]

I found an interesting notation while reading the BMW N63 Engine - Technical Training Workbook (Page 20)

Note: If the exhaust system produces blue smoke, it is necessary to check whether the engine is also drawing oil into the combustion chamber through the crankcase breather, which suggest that there is a fault in the area of the crankcase breather. A clear sign of a problem is an oiled up clean-air pipe.

[Flyinfosheezy]

[HPIA4v2]

Not sure if these two related.
N62 is known to have valve seat problems, it produces blue smoke at dile in the cold.

N63 is not yet known to have this problem, at least I have not seen in in BMW forums.

A clogged CCV will produce smoke but it's milder than valve seta leak.

[aj-x5m]

I've a 2010 x5m 45,000 miles, truck started smoking from the right rear muffler to the point where u can't see the truck, only at idle and initial startup, then the left rear, initially I thought it was the turbos, it turned out to be the crankcase vent, if u pull the air filter assy out u can c the turbo intake tubes, if the tubes r filled with oil it's the crankcase vents that r bad, I changed mines, n no more smoke, parts cost was $300,

[1er_vert]

Originally Posted by aj-x5m

I've a 2010 x5m 45,000 miles, truck started smoking from the right rear muffler to the point where u can't see the truck, only at idle and initial startup, then the left rear, initially I thought it was the turbos, it turned out to be the crankcase vent, if u pull the air filter assy out u can c the turbo intake tubes, if the tubes r filled with oil it's the crankcase vents that r bad, I changed mines, n no more smoke, parts cost was $300,

Do you have a part number of that crankcase vent? TIA

[Sophisticated Redneck]

Originally Posted by 1er_vert

Do you have a part number of that crankcase vent? TIA

Go to realoem.com and type last 7 of your vin, you will then find schematics and part numbers for everything you could possibly need.

[1er_vert]

The bad CCV part is known as "Filtered Air Duct." It actually has an internal, spring-loaded plunger check valve coming directly from the air/oil separator, which draws oil vapor to be burned by the plenum. Constant blue smoke is likely the valve stem seals, and/or the piston rings.

Carbon fouling of the CCV is the leading cause of clogging. As the saying goes, "A redline a day.... keeps the carbon away." The Italian Tune Up really is what these cars are designed for(Autobahn Grand Touring) drive conditions.

[XRatedM]

Originally Posted by 1er_vert

The bad CCV part is known as "Filtered Air Duct." It actually has an internal, spring-loaded plunger check valve coming directly from the air/oil separator, which draws oil vapor to be burned by the plenum. Constant blue smoke is likely the valve stem seals, and/or the piston rings.

Carbon fouling of the CCV is the leading cause of clogging. As the saying goes, "A redline a day.... keeps the carbon away." The Italian Tune Up really is what these cars are designed for(Autobahn Grand Touring) drive conditions.

Thanks for the info.

I'm chasing smoke issues on my truck. Constant blue smoke is probably the piston rings and at cold start is valve stem seals. My truck smokes only after long idle, none at cold start nor constant - I have replaced both intake ducts and oil separators, and installed catch cans but it still smokes after a 30 second idle.

Any thoughts on what it might be?

[1er_vert]

Originally Posted by XRatedM

Thanks for the info.

I'm chasing smoke issues on my truck. Constant blue smoke is probably the piston rings and at cold start is valve stem seals. My truck smokes only after long idle, none at cold start nor constant - I have replaced both intake ducts and oil separators, and installed catch cans but it still smokes after a 30 second idle.

Any thoughts on what it might be?

As long as oil consumption falls within BMW specified range 650 miles+ then its actually normal...