Hi i have a mercedes C180 K sports coupe! Had all four cylinders compression tested and all at 225 psi! No problems with the engine? But when i take the oil cap it breathes heavy! Mercedes of grims?? say thats the way the engines are! But this engine keeps creating oil leaks is this due to the pressurisation of the engine or the garage not doing the job right? If anyone has this type of car or the same engine (1.8 supercharged 4 cylinder engine w203) could you please compare for me, or anyone else who has any idea? Many thanks

 

what do you mean by it breathes heavy?