The recommended oil in that application would be a 5 or 10w 30. Personally i would go with a full synthetic 5w30. Many people on here recommend the high end frams like the ultra guard as the filter of choice. Personally i am not that picky about them as with full synthetic i still change oil every 5k, but you have to mention it to appease the fram police. In any case a full synthetic 5w30, frequent changes and a quality oil filter can do a lot of good in keeping that engine in good shape. If you want to get more specific about which brand of oil to use that'd be over my head and there are people here much better educated than me on that subject.