[tonythetarga]

Did the mechanic identify where the leaks are? You could tackle some yourself if they involve oil return tubes, valve cover gaskets, thermostat etc. Secondly, you might consider going away from synthetic oil and putting in some Brad Penn 20-50, which you can search for here and read up on the "ultimate motor oil thread" or google LN Engineering and read oil comparisons there. I'd be inclined to tackle what I could do myself with the engine in place and then re-evaluate the degree of oil leaking.

edit: please put in your location. You might also ask for a reference for a GOOD shop in your area from members that may be close.