Originally there was a myth that non lead fuels would cause the valve seats to fail in short order. That was proved pretty much false with the exceptions of engines that are required to be at full load for long periods of time. Just cruising around empty like most of us in a 1/2 ton truck, there are absolutely no issues with E10 . With that said, for some reason my riding lawn mower does not like e10, probably because the alky causes it to run at the lean limit or its affinity to attract water.

Last edited by sstock; 02/10/2015 5:13 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration