2007 Cadillac DTS oil leak

2007 Cadillac dts deville has a oil leak,dont think it is the oil pan,filter,what might be the problem and the cost?im in seattle wa need to fine good place to have fixed at low cost.

Sorry Steve , but without actually seeing the vehicle only guesses are possible . And none of those might not even be close. Oil leaks can be expensive to fix or not .
At the top of this site you can click on ( Mechanics Files ) and you may find a mechanic.