>Posted this a while back.
> > "People believe that the oil just rushes right through a two-stroke
> along with the fuel, but that just isn't
> > so. The engine is lubricated by the residual oil that builds up in
> the crankcase. All the oil in the fuel does is replenish this oil. It
> can take an hour or more for the oil migration through a two-stroke to
> result in complete oil exchange.
> > What happens to the oil in your fuel when it goes into the engine?
> While the oil is still suspended in the liquid petrol, it cannot
> lubricate anything. It has about as much lubricity at that point as
> straight petrol. When the petrol enters the engine, it evaporates,
> dropping the oil out of suspension. Now that the oil is free, it can
> lubricate the engine.
> > The best way to determine if you are running enough oil is to check
> the level of the residual oil in the crankcase. When you are using a
> sufficient amount of oil in your mix to thoroughly coat and lubricate
> all of the moving parts, then after the engine is shut down and sits,
> enough oil will drain down into the crankcase to form a small puddle of
> residual oil at the bottom. After a major stripdown rebuilders
> > pour oil into the crankcase.
> > The oil eventually makes it into the combustion chamber, where it is
> either burned, or passes out the exhaust. If the combustion chamber
> temps are too low, such as in an engine that is jetted too rich, the oil
> doesn't burn completely. Instead, some of it hardens into deposits in
> the combustion chamber. The rest becomes the dreaded "spooge". The key
> to all of this working in harmony is to jet lean enough to achieve a
> high enough combustion chamber temperature to burn the oil, but also
> still be able to supply enough oil to protect the engine."
> >
None of the above process begins until the engine is at working temperature,
Until then oil flows straight out with the petrol.
Also the amount of oil each engine uses varies. A small engine or one that is thrashed will use more.
A Large engine used with mechanical sympathy will use less.
The Manufacture gives oil % for worst case scenario.
Most of the oil will settle in the piston in an inverted but not all, hence your oily plug.