[DEALER.]

Hi! Oil consumption is ca 1 litre/3000 km - you need to repair engine -rebuilt. It is much. It can be done aprrox repair costs eastern europe 3000 eur and up. Depends on situation.
on unburned fuel - Can check spark plugs,distributor caps.
Do You have still have your original cats? or it is cutted out and replaced with aftermarket like Magnaflow etc?

 

[DEALER.]

i just have spoken with the mechanic whom "i trust very much" ( a discussable term). He claims that 1 liter of oil per 3000 km is ok and he strongly believes the engine is ok, too. To me this oil consumption seems to be extremely high and I am sure many forum members who will read this will be disgusted about his words. He thinks the car needs a diagnostics and he suspects lambda sensor. HA!

On normal m119 is no need to add oil. If engine eats oil it - it need to rebuilt. Mechanic who says that is ok - is poor educated.
You need to check compression too. How to do shown lower:
Lambda - ask connect to star diagnosis car - do checks, ask for print reading report and show here in forum. Car has obd port to connect pc.
Do all test.

Hi, thanks for your reply. I would not like to rebuild an engine in terms of complete overhauling. I guess pistons and cylinders are ok. Never had troubles with compression. I am leaning towards replacing valve seals (anything else??????) with head on a car, like i saw in youtube videos like this