you know oil will mold if it sits around for awhile..so that could be the green tint. I would have cleaned them up if I were selling them...hope you got them for a great price...I'm with Rob on the "leaking" inner cooler...there is oil present, when not using a catch can, but not enough for crude buildup. And having a roadster to compete against the coupe is priceless...happing modding...