Hi i am new to nitro cars and need help with what fuel to use, i recently purchased a new engine (needs to be broken in) Orion CRF .12 2008 engine and as i saw online wondering what is the meanings as stated on nitro fuel such as 16%,25%,36% ><. oh and 1 more thing for glow plugs i wondering whats the difference cold, medium and hot.

Thank you