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The problem with engine flush, is really you want to then flush it through with 5 litres of fully synth after you have used it to make sure its all gone, lol
If you want to flush the engine, get some 10w40 semi synth, run it for 50-100 miles, then change it when the engine is fully warmed. Don't use chemical flushes, at best they will loosen carbon deposits that were happily doing no damage.