Well you read it right.. Im wondering how to get my seals nice and gummed up so they dont leak. I hear more and more about people with high mileage cars that ran dino there entire life and didnt leak a drop but once they dropped an engine cleaner or a synthetic in there they got leaks. I currently have a slight rear main leak on my 4.0L. I just put a bottle of auto-rx in there and when i do my oil change in a lil under 500 miles ill be going with a 15w40 conventional and another motorcraft filter. I ran 20w-50 last summer and got the pressure that i wanted but got the major leak.. replaced seal and ran 10w30 and leak went away then came back ever so slighlty and the pressure was really low so im looking for a middle and that would be the 15w40. Im hoping the pressure can stay high enough at hot idle and also that it wont leak. Im thinking castrol 15w40 or possibly mobil 1 delvac stuff but isnt the M1 a synthetic? Was thinking about mixing Valvoline MaxLife 10w30 and 20w-50 maxlife but heard that its actually just stop leak in the oil and i dont want the temp fix. The leak is very small but im wondering if the auto-rx does not fix it by cleaning everything if i could go the opposite direction and get it gunked up enough to not leak.
