Might be necessary for vehicles without Oil Filter.
Installed on a BirdCity155. The BirdCity155 has a drain bolt that is not visible from the outside, so it is almost pointless to look at it.
The Instruction Manual says to replace it every 5000 km, but I guess that means it's out if you loosen it twice or so… But I don't think it's going to happen immediately if you replace the OilGasket properly.:In addition to being aluminum, the bolt itself is not as strong as it should be due to the hole for the oil temperature sensor, so it is best to be careful about the torque of the bolt.