I just changed the oil in my 66 f-85 with a 330cid , I used the mobile one high mileage 10w-40, my motor has 13,000 original miles on it, it is starting to seep oil. I figure this oil is supposed to help dried out seals and gaskets, so what the hell I am trying it. I also used some zdpp zinc additive. Any thoughts or problems that could happen? thanks