If I were you, I would bring it back to the dealership and have them fix it. There's a good chance that when tech pulled the drain plug that he didn't replace the drain plug washer. You should also check to see how much oil you actually have right now. The last thing you want to do is run your car without oil in it.
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2006 BWB Lexus IS 350
1995 Acura Integra DC2 GS-R (SOLD )
1987 Mitsubishi Mighty Max Sport aka "Peanut Butter"