The ownersâ€™ manual is no longer available for this model. Sometimes the recommended ratio will be listed on the gas tank or the gas cap. Look carefully for a label on the product. If you do not find the exact ratio listed, then you should be able to run the trimmer on a ratio of 40:1. Many 2 cycle engines will normally run on a gas to oil ratio of 40:1. This involves adding 3.2 oz. of 2 cycle oil to 1 gallon of gas. You can normally run between 32:1 (4 oz. oil to 1 gallon of gas) to 50:1 (2.6 oz. oil to 1 gallon of gas).
If you require further assistance please resubmit your question with more details. I will be looking forward to helping you again in the near future.