Smoking white from tailpipe?? N62, N72 family engines applies to any V8, V12 from 2002 AND UP.
So most likely if you own bmw with N62 or N73 engine, most likely you have oil consumption or you noticed your car smokes white after prolonged sitting and idling??? Well this is the worst and very common problem with these engines. Do not listen to any fairy tales and accept it:
YOU NEED NEW VALVE SEALS! AND IT ALSO CAUSES CLOGGED AIR PORTS ON N62B44
Nothing will help and don’t waste your time and money:
-don’t even try thicker oils, it won’t help and is very bad for vanos lines
-don’t think any seafoming can help
You can replace CCV or mushroom valves on the valve covers. If they are cracked, you will get check engine light or simply it will introduce oil fumes into combustion camera. But here is the catch:
even if CCV is bad and torn completely, there is not much oil in the fumes to produce that much smoke anyways, even if you connect crankcase line directly into intake manifold (this is how it was connected in old cars anyways), you will not get much or any noticeable white smoke if compression is good, but it will affect oil consumption for sure.
But when valve seals are bad, you will definitely introduce lots of oil into the combustion camera, because it leaks right on the piston, compared to CCV, when there is time to mix oil fumes with intake air.
this what you need:
FAILURE TO REPLACE VALVE SEALS WILL CAUSE:
-CATALYTHIC CONVERTERS FAILURE SOONER OR LATER
-RESTRICTED AIR FLOW FOR SECONADRY INJECTION PORTS ON 745LI, 645I, 545I, 745I
-WILL DAMAGE SPARK PLUGS
-WILL MAKE YOUR COMBUSTION CAMERA DIRTY, CAUSING ENEVEN IDLE AND POWER LOSS
-DRIVING WITH LOW OIL LEVEL WILL DAMAGE THE ENGINE
-WILL CLOG MUFFLERS AS WELL
So long story short you need valve seal job, which is expensive even at small shops 1500$-3000$ or 8000-9000$ at BMW dealerships!!!!! Good news is new valve seals were updated and will last for long.
My GOOD recommendations:
-YOU CAN DO IT WITHOUT REMOVING HEADS
-AVOID AGA MAGICAL TOOL: IT IS MUCH FASTER AND EASIER TO REMOVE CAMS AND DO IT RIGHT.
-ALWAYS REPLACE UPPER TIMING CHAIN COVER GASKETS ALONG WITH NEW VALVE COVER GASKETS
-REPLACE CHAIN TENSIONERS IN THE HEADS, BUT I ALSO RECOMMEND NEW CHAIN GUIDES, BECAUSE THEY DO WEAR OUT AND CAUSE UNEVEN IDLE AND POWER LOSS.
-INSTALL NEW CCV AND CLEAN CCV LINES EVERY 60KMLS
-DO NOT EVEN THINK ABOUT USED ENGINE!!! IT COULD AS BAD AS YOURS, BECAUSE RUBBER VALVE SEALS DO AGE WITH YEARS OF SITTING BADLY.
ALL VEHICLES EQUIPPED WITH N62 ENGINES WILL EXPERINCE THIS PROBLEM SOONER OR LATER! IT CAN HAPPEN EVEN TO LOW MILES CARS, EVEN 40-60KMLS, SO WHEN YOU BUY N62 CAR