Blowing from the wind?? WTH kind of diagnosis is that?

Step 1: Don't get your oil changed there anymore, do it yourself.
Step 2: Jack up the car and wipe everything down with a good amount of brake clean...
Step 3: Drive it a few days...jack it up again...check to see where there is oil seepage coming from. Could be valve cover gaskets, front or rear cover gaskets, oil pan gasket...