Hi all, was wondering about the durability of my truck, I've been doing some plowing and pulling stuck trucks out with it and wanted to make sure I'm not doing anything to hurt it. I have a 91' 3/4 ton 8600lb GVW, 350/4L80E, Western Pro-Plow. The truck as 179K on the motor, tranny was completely rebuilt about 40K ago. The motor has been run on amsoil since around 50K, continues to run very strong, had a valce job 30K ago also. Should I have anything to worry about? So far its been great truck since I got it. Just looking out for what to do to preserve it and keep it running like a top. Thanks guys.