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I also found out mine was a 2007 and up instead of an 06. It took 3 oil filters before I figured out that the engine I had, used the newer metric threads. The 4.8 is a good engine, my dad's truck has one in it, but I'll never buy another engine off craigslist unless I actually get to see the truck it's coming out of. It's not that I don't like the 4.8 but when you buy something, you want what's advertised. Also I passed up a lot of good deals for the 4.8 4l60e combo because I was looking for a 5.3 4l60e combo without 4 wheel drive.