Oil consuming i have a mercedes benz c220 cdi year 2001 i have made around 150 000 km.i have changed the oil before 8 000 km and now it needs 1 ltr to add.is this consuming of oil normal or something goes wrong with my engine?

I had got its manual
from online store www.reliable-store.com Here's the site link I am sure they will help you

Does this car have a valet system on it?

Check for external oil leakage along right side of cylinder-head. Oil can burn on exhaust in such small amounts you will not see it or smell it.

hi
you can use any fuser you can find
on eletrical equipment shops

For 2002 Mercedes-Benz C 220 CDI WDB203, engine code 611.962, the engine oil capacity is 6,5 liters, with oil filter replacement.

It's cant say any particular thing as every thing are very important, so best way to do talk with owner and get the car to Mercedes dealer workshop which is the near by your place and tell service adviser your requirement then they will give you a very advance report that's the best way to do it becouse if any simple thing wrong it will cost you too much money for fixing, if you spend little money for checking it worth for you than spend big money for repair, Is this information helped you?

Look under the hood, either on the oil fill cap or a name plate near the radiator

this sign usually something wrong with the eng need to be fix. like oil change do in 8 days

mercedes c220 cdi 2004 140k done gets stuck in gear then have to turn of ignition to get it working again. had recently had the gearbox serviced

Sounds to be a loose or corroded wire/s at either starter motor or at battery fusible links.
Also check the earth strap (Cable) between engine and bodywork.
Hope this helps, MMP