Re: Failed Inspection.
This reminds me of when I had old fuel in my truck. Basically I use only 87 octane in my dodge ram but I rarely drive it. I took it in for inspection and it failed. I took it home put some seafoam in the fuel. Drove that till I needed a fill up and then filled up with premium took it back and it passed. So I would go with what the others said, basic service, then drive it hard and hot to clean what you can of the CAT fill it up with a good quality fuel mid grade or better and let them run it again.
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