However, in October 2018, President Trump directed the EPA to expand waivers for E15 so it can be sold year-round. This went into effect June 1, 2019. Note, that, according to the Department of Energy, stations are not required to sell E15, but offer it due to equipment grants and better profit margins. Also, E10 remains the limit for passenger vehicles older than model year 2001.Boating has reported the issues E10 fuel has caused boaters since its sale was mandated by the Renewable Fuels Act in 2006, but with E15 now widely available, we wondered what might happen to your boat engine if you tried to run it on E15. Not just your new engine, but your legacy engine—your 1972 Johnson, for example. To find out, we spoke to experts at BRP, Volvo Penta, Mercury and Yamaha, and the answer should warn you off E15.