Keep in mind, unless you hand him the owners manual, they will not know any of the torque specs for the oil filter or the drain plug.
In my experience with my other vehicles, they almost alway overfill or underfill, they are usually kids (in california anyway) and they have no investment (like their job) in the performnace of your vehicle. A little inconvenience during your four year warranty, could go a long way in the mechanical soundness of your truck.
again, my 2 cents
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