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Place pork on a large plate. Brush oyster sauce over all sides.
                         
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In a small bowl combine paprika, garlic powder, onion powder, and black pepper. Stir to combine.
                         
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Sprinkle and rub the spice mixture evenly over all sides of the pork.
                         
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Cover and refrigerator for at least 3 hours or overnight.
                         
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To cook, place pork in a slow cooker and set to low. Cook until pork tender, about 9 hours.
                         
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Pour off juices into a small bowl, and strain out any visible fat. Pour juices back into the slow cooker and using two forks pull the pork apart. Ready to serve.