[hamiam]

You can go one of two ways with the Nissan: 1. Stick the bottom of the engine in a bucket of fresh water. Start the engine and let it run for a bit. 2. Nissan has a "nipple" that screws into a port on the engine to which you can attach a tube and flush it that way. All that being said, it is only really nessessary to flush the engine at the end of the season or anytime you indeed on not using it for long periods of time. Good Luck.