Russell Kent wrote:

Tracy Crook wrote:

I do dump it [apex seal cooling/lubing oil] in the [fuel] tank but I try
to do it as the line boy is filling the tank so that the oil is mixed in the
process.

I'm just a silly software engineer, but it seems to me that:

  1. You (as the pilot) have a rough idea of how much fuel is going to be
     added,
  2. You know what fuel:oil ratio you want,
  3. You will get a receipt indicating how much fuel was actually added.

Can't you just pour in an amount of oil equal to the appropriate amount to
equal the desired fuel:oil ratio if the estimated fuel yet-to-be added?  Let
the fueling action mix it.  Then check your estimated fuel added versus the
receipt.  Even if your WAG is off 100%, you end up with either a 64:1 ratio on
the high side, or a 256:1 ratio on the low side, instead of the desired 128:1
ratio.  If you estimated on the low side, then add the make-up oil after
fueling.

Granted, 256:1 isn't optimal, but it's better than none, and it will eventually
get to 128:1 as the make-up oil mixes with the fuel.  Besides, if your fuel
estimate is that far off, perhaps you should take it as a signal to review your
fuel management technique.  :-)

Russell Kent

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