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Amsoil Synthetic Oil change 5W40
I recently switched to amsoil synthetic CJ-4 5w40 at 6k miles. I have found that the truck seems to runs smoother when cold (I live in Canada, it currently snows) and that my Regen frequency are further apart.
Gas mileage is the same, but I suspect that it is better but since I now have to let it idle longer I cannot prove it.
Overall, I am satisfied and will continue to use the oil.