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Excessive fuel contamination within an engine can occur with injector leaks and leaking lines. This type of excessive contamination, due to mechanical failures, cannot be prevented by the add-on filter, therefore, an oil drain must be performed. However, normal fluid contamination due to blow-by can be held in check.

Every liquid-fueled engine will have a certain amount of raw fuel in its normal blow-by. The only way that fuel dilution can build up within a healthy engine is if there is a sufficient amount of solid contamination for the fuel molecules to adhere to. If this solid contamination is not present, raw fuel is evaporated by the internal heat of the engine. Also, by reducing the amount of solid contamination within the engine, blow-by is reduced to a minimum.