Fuel Facts

Most fuel stabilizers form a layer over the top of the gasoline and greatly reduce the rate the fuel's volatile compounds evaporate. They also prevent the absorption of moisture by the fuel. If fuel stabilizer is added to gasoline the day the gasoline is purchased, the fuel will stay fresh longer. Toro offers a Premium Fuel Treatment to help ensure reliable engine performance and protection against ethanol's harmful effects. The product is available from authorized Toro dealers or can be ordered from www.toro.com.

Fuel deteriorates over time. Deterioration begins with the most volatile compounds evaporating. Once evaporation reaches a certain point it will be hard/impossible to start the machine. As more compounds evaporate, the fuel will form brown gummy deposits in the system. Given enough time the gummy deposits will become a hard varnish. Gummy deposits and varnish can plug passages in the carburetor preventing the engine from running or causing the engine to run poorly (surging, lack of power, stalls, etc.). Deposits can also cause the carburetor to leak fuel if they prevent the float needle from sealing properly.

Unleaded gasoline with an octane rating of at least 87 ((R+M)/2 rating method) is the recommended fuel grade for all gasoline engines in Toro products. Gasoline with up to 10% ethanol (gasohol) or 15% MTBE (methyl tertiary butyl ether) by volume is acceptable. Ethanol and MTBE are not the same. Gasoline with 15% ethanol (E15) by volume is not approved for use. Never use gasoline that contains more than 10% ethanol by volume, such as E15 (contains 15% ethanol), E20 (contains 20% ethanol), or E85 (contains up to 85% ethanol ). Using unapproved gasoline may cause performance problems and/or engine damage which may not be covered under warranty. Keep in mind that ethanol fuel blends will absorb water from the atmosphere and can cause corrosion of fuel system components. Since most carburetors and the gas tank are vented to the atmosphere in some manner there is nothing to prevent fuel from absorbing moisture over time. Using fresh fuel (less than 30 days old) will help prevent water absorption from becoming a problem.

Engines produced to date for use in outdoor power equipment are not designed for gasoline with more than 10% ethanol (such as E15, E20 and E85); using higher ethanol fuel blends may lead to engine damage and/or performance issues. We recommend individuals read the Engine Operator's Manual and Equipment Operator's Manual for information on what fuel can, and cannot, be used in their machine and to understand applicable warranty coverage and exclusions.

Gasoline with no ethanol will greatly reduce the amount of moisture the gasoline can absorb from the atmosphere. Many areas of the country have ethanol-free gas available, and finding it is easy. Search for "ethanol free gasoline" on the Internet.

Gasoline with up to 10% ethanol (gasohol) or 15% MTBE (methyl tertiary butyl ether) by volume is acceptable. Ethanol and MTBE are not the same. Gasoline with 15% ethanol (E15) by volume is not approved for use. Never use gasoline that contains more than 10% ethanol by volume ethanol, such as E15 (contains 15% ethanol), E20 (contains 20% ethanol), or E85 (contains up to 85% ethanol).

To serve as an important reminder, download a one-page reference guide summarizing these fuel facts.