Alright. While
@StephK87 is getting his strength back, here is another detail of 7310:
In the crankcase, above the oil tank there are two expansion chambers, stacked one on top of another. The top one has a two-way breather.
When the chainsaw is put into warmer conditions, oil and air obviously expand. If the chainsaw is upright, the air passes both connecting expansion chambers and exits through the two way breather. The tank remains unpressurised, the oil is not pushed via oil pump to form a puddle.
Even if the chainsaw rests on it’s side, there is virtually no possibility to fill both expansion chambers to reach the breather and leave a puddle.
The tank and both chambers are connected by a narrow passage in simpliest possible way - there is no gasket between them.