Has anyone noticed increased noise with QHP? I got a 5 qt jug with the rebate offer, and put it in our Jeep 3.7. There is definitely some valvetrain clatter at idle that wasn't there before. When we bought it last Oct, it had fresh QS dino, to which I added ARX. I used Formula Shell for the rinse phase. I'm sure not complaining about the QHP...we just took a trip to CO, and I got the best mpg I've seen so far. I was just curious if others had noticed the increased noise.