RcRenew nitro fuel oil additive. Fuel companies are using cheaper oil these days. This additive adds a super high quality oil package to your fuel for extra engine protection and performance. Each bottle works for 2 gallons of fuel. The bottle has a half way line on the label. Just add half bottle to a gallon of fuel to add 1% of oil content. To provide a higher grade lubrication package to ANY fuel! Or us this to add extra protection during break in!