2010 W204 spark plugs change questions

Hello Sir,

Quick question on 2010 C350 4M W204 that 2 T30 how tight I have to tight them up are they like 9Nm .

And also the Spark Plug are they 22 Nm. I see someone say between 16 - 18 or 19 Ft-lb. When there is a range and if so what is your recommend Nm I use ?

I hope I don't break the plug when I going to take them out. Since this in the first time this C350 change plug. 12 Yrs and 110,000 Km Here is Alberta is cold and dry.

Thanks !

Spencer