I have lead in the oil of my 2008 Ford Edge
First time I heard that, what service did your mechanic want to perform on your car? You can have your oil analyzed by a lab to determine how much of one compound or another are in your oil...http://www.blackstone-labs.com/what-is-oil-analysis.php
I think you should go back to your mechanic and verify what your saying, if he insists you have lead in your oil I would look for a new garage, that makes zero sense.
Years ago when cars used Babbitt bearings in the crank it would indicate impending crank failure. You need a new mechanic.
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