I'd find a different service department because that's not right unless you meant 4000 miles rather then 400. What year is your truck and have you had all the reflashes done like the G30 and PCM? I ask because since I had those two done I don't see the warning as often and when I do change the oil it doesn't smell like diesel the way it use to which is a sign of a rich running truck.
Welcome to the site and I too am a Kubota man. I own 3.
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