Question

Which is the best example of immiscible liquids?

Answer 1

"Lava lamps": the liquid is a plastic with a very low melting point. 

"lighter fluid" and whiskey: lighter fluid is xylene and it does not mix with either ethanol nor water. 

Silicon lubricant and milk: silicon oil is similar to ordinary oil. Milk contains emulsifiers to dissolve oil, but I doubt these work with silicon. 

Gasoline and grape juice: gasoline is a hydrocarbon and these compounds don't mix with sugar nor water.

Answer 2

Oil and water. Immiscible liquids do not mix.