B7 s4 oil leak diagnosis

[rsrc49]

I took car for oil change after purchasing and was told I have a small leak. They said it was a seal on the front part of the motor and quoted 500 to fix. I didn't see or smell oil..... After several days they said they missed diagnosed it and now they don't know where it's coming from. Now I see and smell oil! They only charged me for the seal part and no labor. I guess I have to take it to Audi? I just want to get it right as I love the car and runs and sounds great.
Any advice or comments.
Thanks
Steve

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[caliizaktiv]

Try valve cover gaskets. The oil will leak out of the front half moon seals and drip down the front of your motor.