Hello! I hope you all have a happy new year! I have (W203 C230 Sport 2007 V6 M272).
I changed the engine oil + filter three weeks ago. The car takes 8L and I applied precisely 8L.
After two weeks, I noticed:
- Some oil in the coolant reservoir
- Some steam smoke from the hood of the car where the coolant reservoir is located.
- The coolant level decreased.
It was the oil cooler messing up!
At that time I noticed the oil level was higher than before on the dipstick! It is like 1.5 (cm) above the red plastic mark!
2 days ago, I replaced the oil cooler with a new one, flushed the cooling system, and applied a new coolant/antifreeze.
I understand the oil cooler issue caused an increase in the oil pressure (as I read), but why after fixing the problem the oil level still high now?
Please tell me what to do. Because I've read a high oil level will cause major problems and may damage the engine! 
Another wide question, * do I need to change the oil too? *
Regarding this picture Link, my oil level is above number (1) at around ~1.5 (cm).
Well let's pray you don't have a blowing head gasket. That's a good water and a coolant. And the oil level go up because oil is mixing with the water that gets in there
