Ovra3, no it's not going to do any harm to the engine, if it continues to seep (weep) from a leaking gasket. Of course there is a slight loss of oil, and it looks horrible. A good mechanic would simply replace the leaking gasket, and solve the problem. This is your best course of action when you have the time. Just make sure you check the oil regularly, and make a plan to get the gasket replaced as soon as convenient. Happens all the time, so don't worry. Just enjoy your A3.