That has got to be the thickest fluid I have ever seen. Your RPO codes will be located in the trunk, underneath the carpet, on top of the spare tire cover.
Nice tuneup list. Add to that (as preventative maintainance):
Take off your coils (note the order they are in), and clean that ICM real good. Check for corrosion on the terminals, take care of it, and apply dilectric grease to said terminals, then reinstall the coils. May or may not needs to be done, but will knock out any potential problems later on.
Throttle body cleanout.
Vaccuum lines. Make sure none are cooked, caked, falling apart, or busted. Replace ANY that seem suspect.
Also note your oil pressure readings before and after your oil change. My SSE pressure changed dramatically after a new oil and flilter change
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.