Gasoline containing more than 10 percent ethanol (E10) can be harmful to outdoor power equipment and other small engine products, like lawn mowers, snow throwers, trimmers and more, according to  The Outdoor Power Equipment Institute (OPEI).

“Using fuel with more than 10 percent ethanol in any gasoline-powered outdoor power equipment can void manufacturer’s warranties and damage the engine,” said Kris Kiser, president and CEO of OPEI. “We hope that equipment dealers, manufacturers and suppliers will distribute these updated materials and remind consumers to ‘look before you pump’.”

According to 2016 national polls by Nielsen/Harris and OPEI, consumers remain confused about the changing fuels marketplace. Less than one third—31 percent of poll respondents—knew that gasoline blends in excess of E10 are harmful to outdoor power equipment. Five percent knew that gasoline blends in excess of E10 are not approved for use in small engines. Sixty percent of poll respondents assumed that any retail fuel is safe for any type of engine.

OPEI, the trade association representing power equipment, engine and utility vehicle manufacturers and suppliers, updated its free consumer and dealer education materials as part of its “Look Before You Pump” campaign. The change reflects the increased availability of higher ethanol fuel blends at gasoline filling stations, the association said.

“As an industry, we need to educate consumers about proper and safe fueling so they can make smart decisions at the pump,” said Kiser. “The ‘Look Before You Pump’ materials can help dealers, suppliers and manufacturers initiate conversations about proper fueling with consumers.”

OPEI launched its “Look Before You Pump” campaign in 2013. Digital versions of the materials are free to download on the “Look Before You Pump” website.

Correction: A previous headline on this post incorrectly stated E10 gasoline was harmful to small engine products. The headline has been updated and corrected.