8000 hrs related to a road going vehicle amounts to probably around 300,000 miles. This is definitelyt not a time that the average small truck engine would be overhauled. They would generally run a lot longer than that.
And your engine relatively is in a very stress-free environment, running at constant speeds with constant loads. Unlike a vehicle engine that is constantly working hard up and down the rev and work-load ranges.
There is no reason to believe that if the engine has been routinely cared for that 8000 hrs is the end of the road so to speak. So if you have a compression test done, get a master guage to check your oil pressure and maybe do an oil analysis as a previous poster recommended and it all comes up clean, then spend your money on some new spare injectors, maybe a reconditioned pump and bundles of filters and hit the road (figuratively speaking).
It has often been said in the transport industry, give an engine clean air, clean fuel and clean oil and it will run forever. I subscribe to that edict. And thus I agree with the popular sentiment above - if it ain't broke etc.
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