ORIGINAL: TCraft Lover

Hello All,
I popped the head off of my ST45 for the first time this morning and was very surprised to see a dark green tint on top of the piston and on the head. I've been using Cool Power 15% most recently. Is it normal for an engine to take on the color of the fuel it is using?

SORRY! I'VE OBVIOUSLY SELECTED THE WRONG PHOTO. WILL TRY AGAIN[img][/img]