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The oil may be leaking from the rear main engine seal in the rear of the engine, or the oil pan gasket. I am uncertain why the mechanic could not detect the cause of the leak? If there is no visible oil leak (drips on vehicle, spots on ground etc..), then it may be burning the oil internally, usually a sign of a cracked head gasket.
It may also be possible that the mechanic did not follow the correct bolt tightening sequence and torque specifications during installation of new gasket.
So as the mechanic stated, it really could be a "variety" of things, but I am pretty certain that is HIS/HER job to figure that out ;)
If you need further assistance just let me know.
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Hope this information helps you out.
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Saturday, January 10th, 2009 AT 10:36 PM