IM going to have to make a decision soon. Im down to Mobile 5000 or what ever they call it now, PYB, or Motorcraft. It takes 5w 30. PYB and Motorcraft are about the same price in my area and the Mobile is a bit cheaper. I still use the AC delco PF 52 filters that are pretty cheap. I have read that the 4.3 engine is pretty easy on oil. The current fill is Mobile 5K and Im about 1K miles from the 5K change. I hope I have not pushed it too far. What do you think? Bear in mind sometimes I get really busy and could go over the 5K by 500 miles. I just cant stomach the high priced synthetics on this old truck any longer. Am I right in thinking that the PYB or Motorcraft is a bit better oil and will take the higher mileage a bit better? IM no guru and try to understand what I read.