The thing is, R-15 will eat engine seals, mixing coolant and oil which turns into overheating and engine overhauls in cars pre and post 2007.

R-15 is a measure for insulation, Donuel. I think you mean E-15 fuel, which is a mixture of 15% ethanol with 85% gasoline. Snopes says your contention is partly true, although not the part about blaming Trump.

-Joe-