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.
Less common causes that come to mine was a error in manufacturing, damaging the filter before installing it, a bad seal on the filter, *maybe* really high engine oil pressure (never heard of that being an issue though), the filter mount on the engine being loose or it simply is the wrong oil filter.