Personally I wouldn't put diesel in the oil as it'll thin it out and risk damaging the bearings and cam journals. Plus any carbon deposits which are in the oil ways that get loosened by the diesel will end up in the cam tensioners and kill them.
Maybe that would work on a big block Chevy or a Detroit Diesel but I wouldn't try it in a highly strung multivalve alloy V8.
ATF would be a safer bet as at least is has some lubricating properties and reasonable viscosity along with significant detergent properties, so it wouldn't harm the bearings.
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