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How many miles ago did the dealer change the oil? Like others have said, ALWAYS check your oil after you get it changed. Have you been leaking any oil lately? Do you see white or blue smoke ever come out of your exhaust upon start up or just driving it? Have you been keeping your eye on your temp gauge and has it been driving hotter than normal? Also, have you switched gas stations lately or have you used a different grade of fuel? Engine knocking is usually bad or improper fuel, but if you are low on oil that can cause your ending temp to increase thus create the knocking. I would imagine if you were low on fuel you would either be burning fuel because of excess heat, get a low oil light or your engine would overheat.
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