Thanks Dictator! When I first started reading on SSR Fanatic I kept reading that I didn't need to change all 8 cylinders at the same time, only the one leaking and the same one on the other side. Now I'm reading to change all at the same time becaust is such a job and most are saying it's only a short time before other cylinders will start leaking. Which of these do you think is the best; I do appreciate your advise.