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Mike- Is this an all wheel steer version of the 425?

First time post, long time lurker... I'm also considering using the 5w-40 Rotella T in two of my vehicles. The first is a 2000 GMC Sierra with the 5.3 liter engine, with a 3.73 rear end. It has 41,000 miles on it, and is occasionally used to pull a 25', 7000# travel trailer. I change oil every...