Excuse me, i can't write english very good. I have a problem in oil engine, please help me. The oil stay one side of engine, and does not go to other side. Both sides have this problem.that's mean, if each side have oil, does not go to other side. When i full oil and turn on motor, all of the oil go to left side with oil pump and stay here,and Then the oil exit from cylinder head cover. What is the problem?