1. The oil filter should be changed every 10,000 km on engines manufactured before 1980 and every 8,000 km on engines manufactured after 1980.
2. Place a container under the oil filter, unscrew the central bolt of the filter housing, drain the oil and remove the filter element.
3. Wash the filter housing with kerosene and dry. If necessary, remove the spring seat and bolt from the body and replace the O-ring.
4. Insert the new element, install the body and tighten the center bolt. Turn the housing to make sure the O-ring is in the correct position in its seat.