Be sure to keep an eye on the oil level on the engine oil dipstick. Every time you fill with gas, until you get an idea how much oil you are loosing.
I don't have experience w/you make/model. But in my experience with econo-boxes, the most likely place for an oil leak to start is the valve cover gaskets. These are usually fairly inexpensive to replace. Ask your mechanic to inspect them for leaks. Sometimes all that needs to be done is tighten a few bolts on the valve cover. But don't do this yourself, as the bolt torque specs have to be adhered to, otherwise you can easily make a simple to fix problem into a difficult to fix problem.