Problem Audi A4-B5 AJM Oil everywhere



I searched the forum and did not find this problem.

I opened the engine cover and noticed on the air intake that comes from the intercooler that there are many traces of oil.

The car doesn't eat oil almost at all (I don't fill up between changes), but it's annoying to see everything greased.

I would like to know what I need to change to avoid this and if I can do the operation in question.