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.
Car Maintenance with 90+ answers. Most likely the same cause as would allow oil to leak into the car's coolant: A pathway between two fluid carrying systems (oil and coolant) in the car's engine has been formed, and now the two fluids are mixing when they ought not to be. Most likely cause would be a leaking - or blown - head gasket.