Thought I'd post up my 2 runs of Rotella T5 10W30. The engine seems to like it. Did not tow much in this last uoa. The first uoa was towing 10k about 3,000 miles. I was debating going to a 15w40 to experiment but not sure. The truck is tuned and emissions disabled.
http://i699.photobucket.com/albums/vv353/DerekLS6/image.jpg
http://i699.photobucket.com/albums/vv353/DerekLS6/image.jpg
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