I recently bought my first Toyota vehicle and it didnt come with a manual. From my research I have found the 5W-30/5000 miles oil change interval. Are you guys using full synthetic or regular dino oil? My 97 has the 3.5 engine with 112000 miles on it. The dealership changed it when we bought it so I have a few more miles to go. Are yall going the full 5000 or are you doing it at 3000 miles? I usually use Castrol in my other vehicles, is there another that would be better? What about filters, OEM all the way or Napa/Wix?