blue thunder06

i have a 2003 7.3 lariat that isnt starting at the moment, it has roughly 260,000 miles on it. we took out the glow plugs and they were soaked in oil, we also noticed oil in the cylinders. could that have happened when we took out the glow plugs or prior to taking them out? and also should we go ahead and change the oil if there is a leak into the cylinders