I just changed the oil and filter at a Meineke store, and now the car has the oil level warning light on. Is the first time in 13 years that this happens, did they do something wrong?. I asked for synthetic oil. Car has 110,000 miles and this is also the first time that I service the car out from the dealer.
Light turns on 30-60 seconds after I start the car. I want help in how to reset that warning.

what year car?

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Car is 1995, with zero mechanical problems since new.

How is the oil level? Maybe you are a quart or two low. You can't trust these guys!

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Oil level is ok. Light turned on at Meineke store as soon as they changed the oil, but they know nothing about Mercedes ( too late to know this). Is the sender inside the oil pan? or can it be tested from outside? Is this a dealer job?

I don't see how this is there fault. The sender is a float inside the oil pan, and if its going to fail its going to fail. You can either wait until your next oil change to replace it or drain the oil and change it now.

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With the wires from the float switch disconnected is the low oil light lit? If so ground the wire and see if it goes out then you will know..