Well I did all the work today. Maxlife 10W-40 (chevy dealer was putting in 10W-40 since thats where my grandfather has gone for oil changes since it was new. Along with new Purolator PureOne oil filter, it is working great.... Since putting the seafoam in the vacuum line/fuel tank the Check engine light has been on..I figure this is probably normal but I want to check to make sure it didn't screw up the oxygen sensor or something. Also, since the oil change, the valve tappets in the 2.2 have been quite a bit louder than normal, ticking is much louder. Will this even out, and fade away once it breaks in or something? Thanks in advance! (oh also replaced the leaky Valve cover gasket) Edit> Oh again, we need to go to autozone/the dealer to pick up a new Air intake hose since the OE part is broken and ripped at the bottom where it connects to the throttle body, and it leaks. You can tell especially when at WOT. It is also cracked around the MAF sensor (or whatever sensor that is). Sigh, there's another $60.
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