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It's just our family van, but we trailer a boat as well and run our kids all over the place, etc. I have been running Pennzoil Platinum in one of my other cars and have been happy, but it calls for synthetic. I always worry a little when the owners book doesn't out and out say "Synthetic Oil"...

I have a 2007 3500 Express Van with the 6.0L gas engine. My wife and I recently purchased it with 39,000 miles on it. I have no idea what the previous owner was using for oil and have searched here with out getting a clear direction. The owners manual does not specifically call for a synthetic...