Actress Hailee Steinfeld pairs a navy-and-white dress with white strapped sandals at an event in Los Angeles in 2013.
If the oil is on the inside parts of the spark plug like the bottom insulator, that's a bigger issue, you have either leaking valve seals or very leaky piston rings. If your car blows a puff of blue smoke on startup, you probably ave leaky valve seals. If it blows blue smoke all the time, leaky piston rings.
A: A spark plug with dual or more head may cause the increasing of combustion chamber temperature even it also burn the fuel totally, the same effect is also happen when the spark plug being replace with higher heating level. When the cooling system is fine, it may fine. But if what happen is the contrary, the burning oil will cause the oil to vapourise. Beside a cooling reason, a worn piston ring and valve seal may also cause the oil to vapourise. If the oil is also being changed, please take a look at the oil viscosity and grade, a lower viscosity and a synthetic oil may easy to burn by heat.