Pratissoli KS40i Serie Manuel D'utilisation Et D'entretien page 19

In any case the oil must be changed at least once
a year, as it is degraded by oxidation.
For a room temperature other than between 0 °C - 30 °C,
follow the instructions in the following diagram, considering
that oil must have a minimum viscosity of 180 cSt.
Viscosity / Room Temperature diagram
mm /s = cSt
2
The used oil must be poured unto a suitable container and consigned to an authorised recycling centre.
Do not release used oil into the environment under any circumstances.
Ambient temp. (°C)
19