Buddy of mine just picked up a 1996 Lumina with a 3100 that I'll say has a "milkshake motor" ... oil color is gray/milky. Thinking UIM/LIM gaskets here (would be typical for this motor). Just over 103k. Have not pulled the plugs yet to see what they look like. Wondering if there's anything else that we should be doing while digging down and replacing them, and where's the best place to get replacements, and what ones to get (Fel pro, factory, etc)
Thanks
-GV