Today I purchased a 2005 Ford Explorer XLT 2WD with the 4.6L V8. It has 218,300 on the clock and was a local Atlanta one owner vehicle. It is super clean, tight and there are no runs, drips or leaks. The previous owner used a local Firestone tire and lube center with 3,000 mile OCIs. My guess is that it only ever saw dino oil....Kendall is what the sticker has pre-printed on it. I have no idea of the actual brand used. The filler cap has 5W-20 listed as the correct oil to use. I am thinking about running PYB 5W-30 with an Ultra filter and 5,000 OCIs. Thoughts? I'll be changing the oil next weekend and sending a sample over to Blackstone for analysis.