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 15w-40 (dino) 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 10w-30 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 15w-40. Im hoping the pressure can stay high enough at hot idle and also that it wont leak. Im thinking castrol 15w-40 or possibly mobil 1 delvac stuff but isnt the M1 a synthetic? Was thinking about mixing 10w-30 maxlife 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 doesnt fix it by cleaning everything if i could go the opposite direction and get it gunked up enough to not leak.
