We had that engine in our first truck. It had 961,000 miles on it when we traded it in.
Not sure when you should have the first adjustment done, but I have always tried to do the first one at 100,000, the second one at 500,000 and then every 500,000 after that.
I would recommend contacting a Detroit Diesel shop and asking them what the recommended intervals are just to be sure.
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