Had the oil changed today at 461, I was at the dealership for a mud guard install, it was $19.95 extra and I got my first good look under the car, that alone was worth it to me. No leaks and no large particles in the oil that I could see. I listened closely to the initial start up and couldn't hear anything strange but I was in the garage so I may have missed it. My Olds Acheiva used to make a hell of a racket after an oil change.
I plan on doing the Amsoil By-Pass install as soon as funds allow, hopefully around 1000 miles.
2013 Titanium HB - Handling pkg. - Platinum White