[SpudRider]

The crankcase vent of every engine will expel a contaminated liquid which is milky white. If the engine oil is overfilled, the contaminated liquid will also contain motor oil. Some crankcase vents send both the contaminated liquid, and the contaminated gas to the air box. Other crankcase vents expel the contaminated liquid, and the contaminated gas to the outside environment.

The Honda and Zongshen designs are superior, since they separate the contaminated liquid from the contaminated gas. This keeps the oil and contaminated liquid out of the air box, and out of the fuel/air mixture heading for the combustion chamber.

Unlike the Honda design, the Zongshen oil separator also keeps the contaminated liquid from being sent back to the crankcase. Therefore, the Zongshen oil separator helps to keep the motor oil clean from contaminants.