bmw heavily smoking

[obm]

hi forum members. I have a problem of heavy smoking with my bmw 318i 2004 E46.just bought it and it has given me this problem. tried to have it serviced.changed the oil filter but the smoking persists.it seems its allowing oil ro enter the combustion chambers. am so confused. advise

 

[JodyD]

Have you check Valve steam seals, this could be one of the faults

 

[Iceman007]

Replace breather systems and check results and if it then smokes while it idles then maybe valve stem seals after that.

 

[Gordvisr]

There can be three reasons for this.

1. Valve stem seals
2. Rings worn, can even be the sleeves that is worn.
3. A cracked piston.

To test between rings and valve stem seals, if you rev and it smokes it wil be rings, if it idles and smoke, but not smoking when revving it will be valve stem seals.

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3. not so nice have to open to see wheteher it is cracked or not. Pull out you r dipstick when idling if oil pushes out, your rings are defenitly worn

 

[Crash_Nemesis]

To see if Piston Rings are worn or piston cracked, do a compression test.

Is the smoke white?

Car's smoke when oil is burnt during the combustion cycle. Oil is able to pass the piston rings and get above the piston and burn up with the air and fuel as the piston hits top dead center and the spark is ignited.