Blano,
The oil is suspended in the fuel up to and including the time of combustion.
The combusted mixture burns with the oil in suspension, else why would the engine smoke at all, hot or cold at high oil-to-fuel ratios?
While conventional 2-stroke oils are based on mineral oils (mostly brightstocks) with detergent additives and some heavy napthenic solvents, most of the synthetic base oils used in 2-cycles are synthesized hydrocarbons such as polybutenes or PAO's, or oils using esters such as diesters of C36 dimer esters or trimellitates, and TMP polyols (tri-esters). The later three offer less engine fouling through cleaner burning, and lowers levels of deposits on ring grooves, skirts, and undercrowns, and better lubricity (even at lean burn ratios) than even PAO's and polyisobutylenes. Ester solubility alows them to be used without solvents. Esters provide operation down to -56 C or better.
[ October 08, 2003, 12:57 AM: Message edited by: MolaKule ]