Synthetic Oil Improvement in /6

I read this post a while ago and my slant was due for an oil change so I figured I'd give it a try. I had some knock upon start up and my oil light stayed on for usually about 5 secs with 10W30 mobil 1. Changed it to 5W30 and added some ZDDP additive and my knock is gone and the light goes out in about a sec. I dunno about any power gain but the knock is gone and I'm happy with it.