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And what's wrong with a 5.9 ? I'll never sell mine.
I've got three trucks and a Harley, each vehicle has low miles since I'm retired and drive 4 different vehicles. Now considering that I try to maintain each like it's the only one I own, it's very possible for the low mileage and still be a very good buy. (never had a person complain when I sold them my used vehicles).
Like the housing market, prices are inflated the last several years because of the economy, auto manufactures, EPA, fed & state government ... and will never go down.
Have him take it to a qualified and trusted mechanic to get all problems listed.
Also, check recalls listed on the http://www.recall.gov website and with the VIN check Dodge to see what should have been done and if it was done.
Then decide ...