Hey guys. I have a couple of questions. A few years back I owned an LS1 trans am, and have an extra set of spark plugs setting around for it. Would those fit in my 04 5.3 silverado? Also, does anyone run Rotella in their gasser. My grandpa swears by it. I personally prefer Mobile 1. (this is more out of curiousity, I dont plan on switching oils).