Johnny T, The oil concerns for our inline engines are very important but your bring up the Ford Y-block brings me to my youth. As you probably know their rockers are very suspect when it comes to proper oiling. I started with Y's in 1954. My dad had a theroy that alway worked for him and the 3 Y's we had. With every oil change one qt of ATF was included. He believed the added detergent and the lower viscosity was a good thing. I never did it with any late model stuff. Good luck...J.D.
