Experts recommend using motor oil.

Immediately after extracting and inspecting the generator for damage, it is necessary to carefully study the instructions attached to it. Then you need to pour motor oil into the generator. It must be understood that it makes no sense to spare money for quality oil, since to fill the unit is not a very large volume of liquid. Experts recommend using motor oil. When using any oil, the temperature of the medium in which the generator is planned to be taken into account.