JL uses Pennzoil.
I go to Oil Can Henry's (not sure if its just a NW thing...), bring my own filter, and specify Mobil 1 oil. They are kind of pricey ($89 not including the filter) but I don't have to dispose of my old oil, or even get out of the car. They have 4 video camera monitors right outside the drivers window that show front, back, engine compartment, and under the car so you can see everything that's going on at all times. I've never had an issue with them at all and it takes about 10 minutes. They even give you a newspaper to read while you wait. They also start yelling and cheering when I rev the engine during the leak test.

The Flowmaster is pretty loud...