I had some time this morning before football so I removed the passenger side valve cover on my 2002 S10 4.3L v6 with 106K miles on it. I recently replaced the intake manifold gasket @ 100k miles and did 2 short interval oil changes since then. The truck runs smooth and normal since the intake manifold gasket replace. When I removed the valve cover, I found some hard crasty type sludge, not too bad but not good either.
What I did was pour a little MMO on top of one rocker, B12 ontop of another rocker, straight gas on a different rocker and Gunk motor medic flush on a rocker.
What I did was pour a little MMO on top of one rocker, B12 ontop of another rocker, straight gas on a different rocker and Gunk motor medic flush on a rocker.