Originally Posted by
wingracer
25% would be 25% nitromethane, somewhere between 8-14% oil, either castor, synthetic or some combo of the two with the rest methanol. That's it. Some may have small amounts of rust inhibitors, anti-foams or detergents in them but not much and they aren't needed.
In a normal case the oils are making the differences in performance and needed maintenance but you can get Methanol ad Nitro in several ranges of purity. Les purity is cheaper but it will affect the performance, less purity does also mean there is more water in it and that can sometimes be the cause of rust on the bearings and crankshaft.