Have you noticed that your engine is sweating oil? Then know that this is not always a bad sign. Heavily loaded cars/motorcycles are allowed to sweat a little bit of engine oil on their own.
An old car often suffers from oil sweating, this is quite normal as long as it is not extreme. If the engine around the valve cover is very greasy, it is likely an engine that sweats oil. So in this case there is not much going on, this is acceptable.
However, when so much oil is released that it is left on the ground, it is a bad sign. In this case, there really is oil leakage.