My Ford Fiesta Ikon 2002 fails a lot

I started getting a lot of white smoke, then it was thrown when the cables d ebujias and remove them I saw that one of the spark plugs had liquid as an oil I don't know what someone is can help me ?????

First you have to take the compression of the pistons to evaluate the organ of the engine and be sure that you do not fail some valves, and logo if the oil reaches you inside the compartment of the spark plugs is because you have the seals of the bad valves and the oil that are the chulata lasa in the piston and therefore the spark plug that starts to not work and the engine is no longer rod. greetings