Well, it's been a week and about 1000 miles after I changed to Mobil-1 and all I can say is that anyone who want a smoother, more responsive engine should switch to it. It's waaayyyy awesome. Cheapest 'mod' I did IMO. the $26 I paid for it was deffinitely worth it. Pretty much the lowend was smoother although not really noticeable but once you rev it all the way to 6K+, man my engine is just smoooooth yeah!!!!! Power delivery is noticably better and smoother. Plus, I think my milage also improved. So if anybody's planning on changing their oil anytime soon, I DEFINITELY recommend Mobil-1. I think a qoute from Gone in 60secs would best describe using Mobil-1 in you car, 'It'll be a stream-line butterfly!'.