Unfortunately, the product information does not specify the type of oil required for the engine. However, it mentions that the gas pressure washer comes with a powerful 210cc 4-stroke engine.
The gas tank on my new pressure washer smells of gasoline. I have never had this before. If this is for testing purposes then I believe it should be advertised in the listing for information purposes or to list it as used. Where upon I think a price adjustment is in order.