[pgfpro]

What I do once every four months is run 1 liter of water through my engine.

It cleans the tops of the pistons and the combustion chambers of carbon build up.

I just hook a small vacuum hose from a 1 liter water bottle to a vacuum port on the intake and bring the engine rpm up 3000rpm so it won't stall. The engine will steam big time out the exhaust. I also pull all my O2 sensors so they won't be damaged.