Smoke When Puling Away After Idle

[Creativus]

Hi all

I am in need of some advice for my BMW 645 Ci (2004) car ..

I have noticed lately, that when I pull away after being at idle, in traffic or traffic lights for a long period, , I get a cloud of blue grey smoke from the rear of the car. This "smoke' does not appear while driving normally, at high speed or accelerating. Engine sounds and runs fine. I thought, it might be a slow oil leak and its dripping onto the exhaust. But, I am no expert.

Just to add - It only happens when the car is running at its correct temperature ...

Any advice from anyone is much appreciated

Best Regards

Mike

[peacheyd]

Blue smoke usually signifies burning oil, whens the last time you checked the levels / changed it?

[Creativus]

I must admit I am finding myself topping up the oil every now and then. Someone told me that v8's burn a little oil, so didn't think too much of it.

I'm thinking now, that oil is dripping onto a hot exhaust. But how to find it ... Bmw will charge £138 per hour to find it :(

[peacheyd]

Could be valve seals, oil on exhaust wouldn't really do that. Take it to an independent BMW specialist Faaaaaaaar cheaper than BMW and arguably better service. someone else might come along and tell me im wrong on either point.

Burning oil could mean oil has found its way into the cylinder (hence possible valve seals), when you idle and the valves open or not sealed oil builds and finds its way into the cylinder, when you then put ya foot down to move its burned and blue smoke chucked out the back. again (unless someone can correct me)

[Greydog]

I would bet EGR system is clogged so when your at tick over any oils in the re circulation system accumulate instead of being constantly burnt, when you accelerate big cloud of oil smoke. This happens with many marques not just BMW,

[Greydog]

A second thought if you get smoke when you lift off then it could be valve stem oil seals

[kangoo36]

sounds like valve oil seals