Crankcase ventilation filter: this crankcase ventilation filter is slid onto the connection of the oil inlet (you can secure the filter with a hose clamp) and should be connected to the air filter with a hose. One major advantage is that the air filter stays much cleaner, which benefits the engine performance. Check the filter every 5000 km and replace it with a completely new one if it is heavily soiled. Supplied with a chrome-plated top.