Just curious as I'm still new here and new to the real technicals of oils. What are good things to look for in oil add packs? How do I determine that it's a very good oil? What additives are best? What's too low of a value for these additives? Is there such thing as too high? I know for zddp it's rumored that high levels ruin catalytic converters but from what I've read they need to be pretty high. I'm sure there's already been an article on this so if someone can either point me in the right direction or explain it that would be great. Thanks!!!