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just to be fair, when I was a kid I payed for school changing oil in an esso station. We had a pre-change additive that we would add to very dirty oil, idle the car, and then drain and flush out with another litre of oil.
the stuff worked great even if we didn't know what it was. I happened to catch the supplier one day and he told me that the additive was nothing fancier than a diesel/kerosene mix, and that adding a cup of diesel to the oil before a change would do essentially the same thing.
having added diesel to my car before oil changes regularly I cant say that I've ever experienced a negative impact.
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