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A while ago when I hit 20K on the truck the dealer recommended I do an "Induction cleaning" for ~$300. My buddy who is an R&D engineer at Cummins says that the process removes DPM from the valves, EGR, DPF and grid heater and didn't really comment on if it is necessary at 20K/ the corresponding...
Looking to change the diff fluid on my 2500 for the first time at the 30K mark and the dealer told me to go with the 75w-140 instead of the 75w-90 like the manual recommends if you're towing. Any experiences with running 75w-140 with your 11.5" ring gear trucks and will it have any adverse...