Oil seals are natural wear parts of every engine. If they are defective, they can no longer fulfil their very important task of sealing a shaft or axle against an undesirable medium such as air, oil and/or water. This can result in very unpleasant side effects such as false air or loss of oil, which can quickly put an engine out of action. Sometimes defective shaft sealing rings also cause creeping defects, which as such remain undetected at first. A slightly increased idle speed does not arouse the curiosity of inexperienced drivers, but at the latest after a jam on the motorway the question arises: why? In order to prevent this extremely philosophical questioning, it is worthwhile to change shaft seals at regular intervals. Regularly in this case refers to an interval of time or kilometers. Thus, from a mileage of 20,000 km, an engine revision should be considered. In principle, the unopened Vespa engines are also famous for much higher mileage, but fate comes along more often than you would like to on the big tour and decides that the shaft seal, which is the most difficult to change, gives up the ghost exactly when you stand in the loneliest prairie...
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