Last year I went to a new Speedco that opened near me, because they use Rotella-T as their shop oil. They do an analysis while you wait for your oil change and lube, I don't remember how much they charge 'cause I can't find any receipts, just my analysis sheets. A recent one showed high silicone, and I found my inlet hose to the turbo had an open kink where it is attached.
I like Speedco--they always take you right in (4 bays here) and don't mind that it is a pickup in a over the road lube shop. They have you come out from the waiting room and have you witness that the drain plug is torqued while you watch. They are open late at night. I think they are mostly in the East, but I don't know about the Mountain states. They have Baldwin filters on the shelf, so I always bring a Fleetguard to be installed. The only bad thing... their coffee isn't that good late at night just before they close!
david