I am assuming since you posted this question you are not US based where leaded petrol has been phased out since late 70's. The Isuzu KB260 truck was manufactured to use Unleaded petrol. Lead was added to be a lubricant in older engines that were hand machined in factories LONG ago... the valves and all werent as close in tolerance and the lead in teh gas helped keep them in shape. Newer engines, such as your Isuzu, utilize computer machining during assembly and the tolerances are more precise....so the lead is not required. Be sure and use Unleaded in your vehicle.
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Lead in fuel creates a lead oxide protection layer on the valve seat which prevents erosion due to high heat at exhaust port. Leaded fuel is only required for cast iron heads as most if not all engines with aluminium heads (including air cooled beetle - VW engine) have hard chromed valve seat inserts. Not all valves are hard chromed, however most engines from 1970 onward excluding some British marks, can run on unleaded. Machines have existed way longer than the automobile engine. Fine tolerances can be met using "hand machining".
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