DEFINITION: Substance used between moving surfaces to reduce friction?

Questions

Policeman must defuse bus which will blow if it goes below 50 miles per hour?

Pop Kulture: Film in which Divine consumes a fresh dog turd.?

Pop Kulture: What is the longest running soap opera still on the air?

Popeye's chief adversary has two names, bluto & ______?

Power Rangers: Character who says, "Ay ay ay ay ay!"?