I know mine looked dirty and varnished inside. It was varnished. It didn't have tappet noise before the change on Pennzoil YB 10W-40. But now that I switched to Valvoline Maxlife Blend 10W-40 it has louder valve tappet noise, towards Cylinder #1, or #2 I think. (Is maxlife thinner than its PYB dino counterpart?) Still runs great though, apart from that. I discovered the reason it was shifting hard was the TV cable was out of adjustment. Now its set right, shifts are quick and smooth.