[Mojo11BMW]

Hi all,

I've got a 2008 335d no dpf

I'm getting a puff of blue smoke from the car on start up, accompanied by a oily smell and also after accelerating hard and coming off the throttle I see blue smoke - no smell.

Just wondering what the likely causes are? A lot of people say valve stem seals but I've never known a 6 cylinder bmw diesel to have that problem.

Cheers,

[BB_cuda]

I've heard a fair number of folks talk of similar thing and changing the valve cover gasket cured it. Not stating for sure this is your ailment though. there is a thread where 335dsleeper discusses this and his blue smoke went away.

[Mojo11BMW]

Originally Posted by BB_cuda

I've heard a fair number of folks talk of similar thing and changing the valve cover gasket cured it. Not stating for sure this is your ailment though. there is a thread where 335dsleeper discusses this and his blue smoke went away.

Thanks man. Strange you mention it, I just got done reading that thread 😁

I noticed an oil leak from the small turbo feed pipe so that’s being replaced tomorrow or early next week. It’s made a real mess on the left side of the engine. Once fitted and cleaned up I’ll look for fresh leaks. My thinking is pipework leaking causing oil to burn somehow. The thing is these engines are complex and I’m not super knowledgeable as to how and why it would cause my symptoms... so I’m open to as many ideas of where to look, what to replace and why!

Thanks again for the reply

[ddinse]

Still dealing with my 335d leaving a trail of light blue smoke where ever I go. Had a bit of oil dripping from the rear main on heavier driving. Suspected the valve cover gasket so I changed it out. Did not correct my smoking. Ran the Bimmertools injector test tonight and the #4 injector is showing a much higher reading than the others. I will try a leak down test in a few days when my kit arrives. I am hoping it's just a bad injector and not a turbo or valve seals...

[Mojo11BMW]

Originally Posted by ddinse

Still dealing with my 335d leaving a trail of light blue smoke where ever I go. Had a bit of oil dripping from the rear main on heavier driving. Suspected the valve cover gasket so I changed it out. Did not correct my smoking. Ran the Bimmertools injector test tonight and the #4 injector is showing a much higher reading than the others. I will try a leak down test in a few days when my kit arrives. I am hoping it's just a bad injector and not a turbo or valve seals...

There are a few possibilities. Is your smoke constant? That may point to it being more likely to be a turbo...

[ddinse]

It's not too bad at idle. Mostly on acceleration but seems worse when it warms up.

[ddinse]

Removed my catch can set up which I think was undersized and causing increased crankcase pressure (verified by pulling dipstick out while at idle). Went back to stock intake CCV hose and not smoking at all today. Hopefully this was the issue

[lnxguy]

Get rid of the catch can all together, they are a waste of time. If you want to prevent oil getting back into the intake tract, scavenge the CCV to the DP. Only way to do it.

[RL18]

Originally Posted by lnxguy

Get rid of the catch can all together, they are a waste of time. If you want to prevent oil getting back into the intake tract, scavenge the CCV to the DP. Only way to do it.

Not to sound ignorant but can you please explain why you should that and how you would do that.

[ddinse]

Just an update, Getting rid of the catch can took care of my smoking issue and since the valve cover gasket replacement, the rear main leak is gone. When failing,the inner seals of the valve cover allow boosted intake pressure into the head and crankcase which causes oil leak issues