I was always hesitant to get the engine flushed because most people including my mechanic recommended against it since it is a high mileage motor.
I consulted several sources including Liqui Moly by email and experts on other forums who claimed that it would not harm the engine if it was in good working condition.
After getting confirmation from the Honda dealership that the engine was good for another 200,000km I decided to go ahead with the procedure.
I bought Proline Engine Flush for Rs. 540
The oil is for Rs.1850. I've been using this oil for over an year now. It's semi-synthetic and good for 10,000km.





The flushing agent was poured in and the engine was idled for 10 minutes as per the instructions. Then the oil was drained and new oil added.
Observations after the flush
Engine noise: No change, runs just like before
Performance: No perceptible improvement, it's about the same
Vibration: No increase or decrease
So my conclusion is that there were not that many deposits to begin, hence no change in performance.