Mitsubishi Triton 1997: How long will it last for?

THE most cost-effective fix if your engine gives up the ghost is to replace it with another 2.4-litre petrol engine. Switching to a diesel engine is a relatively big job and I don't think there's enough benefit to justify doing it. You would most likely have to change the gearbox and rear axle. You would certainly have to change the fuel system, and I don't believe there would be any increase in towing capacity.