Love my new 2007 STS and want to change the oil and filter....Where did they hide it?

Thanks in advance!

http://www.cadillacfaq.com/faq/answers/36oilchange/index.html

Try under the hood on the upper left side (driver side). It has what looks like a large nut on the canister facing up, may be 7/8" or something like that. Its very easy to remove, it is a canister type so you just replace the element inside once you remove it.