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The oil filler cap seals the valve cover opening where oil is added to the engine, preventing oil vapor and pressure from escaping the crankcase ventilation system. Signs of a failing cap include: an oil mist around the filler area, a rough idle caused by a leaking cap acting as a vacuum leak, or a cap with a deteriorated gasket that no longer seals. Replace a leaking filler cap to seal the crankcase and prevent oil vapor from escaping.
Motorad manufactures engine cooling thermostats, radiator caps, and related components. Known for quality construction and reliable temperature control, Motorad delivers dependable cooling system performance.
