HDN
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I still run 15W-40 and probably will until it needs a rebuild. The shifts in my truck are pretty obvious, mostly sound-wise. I don't think it shifts much rougher than my 2012 Chrysler 200 with the motor oil in itWith the Dexron 3, the shifts are much smoother than with motor oil and less discernible.
When I first got the truck I thought it had a 6-speed automatic. That's when I learned that heavy truck transmissions sound like they're shifting into another gear when the torque converter locks up.