Over the years, valve stem seals become hard and brittle. They no longer seal properly anymore and allow oil to escape through the valve shafts. You can tell from the blue smoke when you start the engine. Replace the valve stem seals and thereby reduce oil consumption.
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Manufacturer information:
BIKE SIDE
Wagnerstraße 27
Baden-Württemberg
Durmersheim, Deutschland, 76448
https://www.bikeside.de
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