What type of oil is used in a ryobi trimmer?

Ryobi trimmers typically use a 2-cycle engine oil if they are gas-powered models. This oil should be mixed with gasoline in the ratio specified in the owner's manual, often 50:1. For electric models, there is no oil required, as they are powered by electricity rather than gasoline. Always refer to the specific model's manual for the correct type of oil and mixing instructions.