oil pressure and different weight oils

This topic is an old one, the newer oils have a drain down feature that reduces lubrication . There is too much detergent,, dispersants,and friction modifiers in the new oil products. This is great for Increased fuel mileage in a newer engine, but old mopars don't like it. "Classic oils"has an article on this that is very Informative. Also, Diesel oils have other additives that mimic oil from 1969. My crate hemi fluctuated 30lbs all the time until I went to a good diesel oil. add a little zinc for fun, lucas 10036. 4 oz per oil change will make all the difference in the world.