High performance with low levels of noise are what you can expect from this ECHO gas blower. The rotational control makes for easy operation and helps cut user fatigue. The blower offers grouped controls with "cruise" for operator convenience. The product comes with a 5 year consumer, 2 year professional warranty. Use a 50:1 ratio of fuel to oil mix for 2-stroke cycle engines. Recommend using only fresh gas with a minimum octane rating of 89 or higher (mid-grade to premium) at all times A 50:1 Ratio = 1 US Gal. 89 Octane + 2.6 fl. oz. ECHO PowerBlend Oil OR ECHO Red Armor Oil PB-255LN blower has a 25.4 cc professional-grade, 2-stroke engine A maximum air volume of 354 CFM and a maximum air speed of 191 mph Unit has a noise rating of 64 dB(A), allowing for low noise performance