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V8's are fun, but everything that is expected to work and last is diesel - large trucks, tractors, trains, heavy equipment. The reason is simple, assuming proper routine maintenance (i.e. regular oil/filter changes and clean fuel), the answer to engine longevity comes down to getting the highest possible engine torque at the lowest possible rpm, using the least amount of moving (and therefore potentially wearing) parts. If BMW had released the X5 with their V10 engine and I were to vote for the V10 in preference to the V8, it would be purely on the basis of fun to drive factor. Sorry guys, but based on reasoned logic, my vote has to be for the diesel.
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