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Thank you for replying ,
The oil seems okay
i forgot to tell you that i took it to mercedes dealers for annual servicing but as soon as i started the car the next day it started smoking.Usually i leave the car for five months without driving and only starts the car and runs for 15--20 minutes.Could grow plugs or catylitic unit has a hand in this. My car is C220 amg Diesel 3 years
before we think of the cylider head gasket is there a way to diagonise the problem