You need to do some reading as if you read farther on Towers Web site you will see that all the fuels they has have the equivalent protection to 18%. With the better oils they have this day and age you do not need as much oil. Anything over 12% oil content can do more harem then good!!!!!!!!!

This is off Towers web site!

Specially formulated fuel blend for competition radio controlled,
glow powered cars and trucks.
O'Donnel Racing fuel contains an advanced lubricant package which
provides engine protection equivalent to that of conventional
lubricants that have an 18% lubricant content. This optimizes
performance and maximizes engine life.