Need advice with Mercedes A180
 

Hi everybody. I found this evening after work that I had a lot of oil infiltrating my coolant reservoir. I drained it out but the more I cleaned the reservoir the oil keep coming out. My engine oil color and oil level are 100%. The car didn't get too hot either. Any suggestions?

Sounds like an internal leak. I'd remove the cooler and its hoses and bench test them. Once the leak is isolated I'd repair it. A seldom used car you could loop the hoses to avoid the cooler and just use it without.