The CRF300 Oil FillGrit Guardgreatly reduces the dirt build up around 300l and 300 Rally oil fill cap. The amount of dirt that can build up behind the fill cap is really frustrating since it is a direct line right into the engine.
It doesn't prevent all dirt or contamination from getting around the plug when used in the absolute worst conditions, but it usually gets it down to a very manageable level. Greatly reducing the chance of dirt contamination in your oil.
