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Engine flush is only (MAYBE) needed after 100k kms, when you have so much chances of engine building the sludge or deposit retention of micro particle. Usually engine oil filter if you are using original filter will do very good job in filtering those micro particle. And any reasonably good engine oil as per car manufacturer specification will provide enough cleaning and lubrication required. If you skipped some service, or delayed it noticeably then you might get an engine flush otherwise no need IMHO.