Everbody has an opinion on this. Search and you will find many, many opinions. Search ZDDP. Without vast discourses on "why", I recommend Mobil 1 extended mileage "gold cap" oil. The Fram cheap lines of filters are reputed to be shit. I change oil every spring whether I need it or not (10-12k miles). I change the filter once around Thanksgiving because I feel guilty and I usually need a quart by then anyway. I just hate having to dispose of all of that Dino oil at 3-5k miles and believe that most of the wear is at cold start up due to thick oil. Like I said, everybody has at least two things, and one of them is opinions.