Exhaust fumes entering cabin. W212 E350CDI

[such01]

I have noticed exhaust smells in the cabin recently - mainly when stationary / in traffic. I thought it may be due to the cars in front but noticed it when the car was on the drive.
I had a nose around and it seems to be coming from the back of the engine - using my nose, not seeing any smoke or obvious sooty residue.
I know the injector seals can fail and cause this.
If this is the case I suppose it would be best to replace all 6 - any ideas on cost to do so at a specialist - can anyone recommend one on North Essex?
Is it likely to be anything else?
The car runs fine except for the odd lumpy start when cold...
Thanks

 

[W1ghty]

Might be oil cooler seals leaking oil from the back of the engine

 

[TeddyRuxpin]

Could be so many things.... e.g. PCV

 

[Larkone]

If this is the case I suppose it would be best to replace all 6 - any ideas on cost to do so at a specialist - can anyone recommend one on North Essex?

Also live in N(W) Essex and I take mine to Alex Crow in Stowmarket because I trust them to do an excellent job.

 

[W1ghty]

+1 For Alex Crow

 

[such01]

Might be oil cooler seals leaking oil from the back of the engine

Oil cooler seals were done around 3 years ago now @120k and replaced with the purple seals

 

[such01]

I'l

Could be so many things.... e.g. PCV

l have a look - I think my OM642 has a different type as I looked into doing the upgrade that was posted on this forum but the pipe disappears behind the engine..

 

[such01]

Also live in N(W) Essex and I take mine to Alex Crow in Stowmarket because I trust them to do an excellent job.

I'll have a chat with them after the hols.. Tx