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.
Oil from stuck piston rings, bad valve guides, etc. also enters the exhaust. Oil consumption often results from extended oil changes. This reduces engine efficiency and the oil passing into the exhaust damages the catalytic converter. Too many short trips at low speed can also cause the catalytic converter to fail.