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With todays synthetic oils you don't need to do engine flushes as most of them have high detergent content anyway, just change them more often like 5k.
In the old days with mineral oils you had to do flushes to break up engine sludge build
up in the head/s, but today its not really necessary and highly not recommended on
old or high km engines as I seen them spin bearings.
The old preferred way to do an engine flush is to warm the engine up and pour 1 litre of kerosene into the motor and run for 20 sec, drop oil and refill with crappy cheap oil, run for about 2 min, drop oil and filter and refill with the good stuff and a fresh new filter.
But that's for extreme sludge build up, sometimes even that wasn't enough so we had to pull rocker cover/s off and clean manually with kerosene and brush.
Todays modern engine oils are pretty good and they come a long way.
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