Oil is plenty to rinse through the engine. No need to thin it with diesel or additives.
The diesel trick isn't uncommon for heavy equipment and commercial diesels that run very thick oil and lots of it so it dilutes quickly. On a gas engine that only holds 5 quarts and runs such light weight the same trick would add a particulate scrub while further thinning the oil. This is a dangerous combination for an engine with some miles on it.
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