How can there be oil in Haojue motorcycle core grinder?

Is it an air purifier? If it is a sponge filter, in order to enhance the effect of filtering dust, the filter will be coated with a little oil, which is normal. If there is too much oil, it may be that the car was put down, rolled over or inverted during transportation and flowed through the engine's snorkel. Clean it up. In addition, check the amount of oil, which may happen if there is too much oil.