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- Regular maintenance of these spark plugs is crucial for optimal performance. Volkswagen recommends changing them every 100,000 miles. Neglecting this can lead to issues like rough idling, decreased acceleration, and even engine failure. Therefore, it's essential to adhere to the manufacturer's guidelines for replacement.
Conventional oil seals are the traditional seals, which can be recognised by a spring on the inside. These oil seals are made of a metal housing that contains a rubber seal. This part is often made of elastomer and comes into contact with the surface of the rotating shaft.



All are fitted with a spring to preload the sealing lip. All these types are for non-pressurised or low-pressure applications up to 0.5 bar for diameters of a limited size. For diameter of 500 mm or more, the maximum pressure is 0.1 bar. For higher pressures, special types or PTFE lip seals can be used.