I use the non deluxe version on my new Nitrotec 21 engine and it made running in an absolute breeze. Also it helps the amount of wear on the starter box motors and rubber wheel as it makes it so much easier to start. I also like the fact that at the start of my heat the engine is up to temperature which would normally have effected my first few laps of the heat. The engine still has a lot of pinch left which many of my engines in the past would have had a lot less left just after just over 1 gallon.