Hi Valerie - The DSH 600-X has a two-stroke engine runs on a mixture of gasoline and oil. We recommend using a regular or super gasoline with an octane rating of at least 89 ROZ and a good-quality, two-stroke oil for air-cooled engines that meets at least the API-TC specification. If you have more questions, please call our customer service team at 1-800-879-8000 (US) or 1-800-363-4458 (CA). Thank you, -Sarah, Hilti North America Social Team
