In  eleven years of editing the newsletter nobody has complained about the
oil  settling
out of the fuel. There are a couple of reasons for this. When you  start
the engine
the fuel pickup in the tanks is at the lowest level  generally so you might
get
an oil rich mixture (as I recall oil floats on  the top of the fuel) but
that is soon
returned to the tank by the fuel  pressure regulator recirculating the
fuel. At idle it
recirculates as much  as 90% of the fuel flowing through the  pump.

Paul Lamar


The real question would probably be best answered by those engineers
closely associated with 2 cycle oil and it's miscibility with aviation or other
fuel.

Oil either mixes with fuel and stays suspended (dissolved for want of a
better word) or floats or sinks. It really can't do all three things. It is
possible that it falls out of solution and then either one of the other two
is  possible.  (If my limited knowledge of physics is still in tact.) If it
floats, it will not collect at the lowest part of the tank (the sump)
yielding  an oil rich mixture. If it sinks it will not float on top of the fuel
(unless  the various densities of hydrocarbons dissociate with each other and
based on  their  density relative to water they either float or sink.

It might be an idea to, during your preflight, to vigorously shake the
wings for two purposes. 1, to mix the oil, 2 to check the continuity of the
spar.

Just a suggestion.

Rich