I have a very loud valve noise that began the 19th...that same night i stopped at a traffic light the oil pressure light came on and the car shut off...it started back up and i proceeded to park..i then checked the oil and it was dangerously low..i put 4qts of oil in and drove it home..on the way home everytime i pushed the clutch it wanted to shut off..i checked the oil again i hadnt lost a qt...im not leaking it and its not burning..so where did it go b4 and what is the problem..thanks for the help