Where can I add cleaning agent for Dongfeng Honda gasoline engine?

Are you talking about engine cleaning agents as oil cleaning agents?

If it is an oil cleaner, it should be added to the old oil and filled from the oil port.

The function of engine cleaning agent is to clean the impurities and sludge produced by engine oil, which can be cleaned with cleaning agent and discharged together with the old engine oil when replacing the engine oil.

Generally, engine cleaning agent is added to the old engine oil, and then the engine is idling for 10 minute to 15 minute, then the engine is turned off, the vehicle is lifted, the oil pan screws are removed, and the old engine oil is discharged.