Bought a truck about a month ago, and within the week changed the oil (havoline 10w30). I noticed that I have a small leak, looks like the rear main seal. Was it because maybe I am running a different oil than the previous owner? (possibly could have been leaking before,but didnt notice) Will valvoline maxlife syn blend stop the leak? It is dodge ram 1998 with 57k miles, still looking to get 5-7k miles a year with me owning it.