Tracy Crook wrote:

Todd Carrico wrote:

Is there a particular problem with running pre-mix in
a daily driver?  Smog?  O2 sensors? etc.?

Smog no worse than the stock engine if you use the same amount
of oil. But that would be defeating the purpose. What State
do you live in?

The O2 sensor is a very good question indeed. I don't know.

Paul Lamar

Yvon Cournoyer wrote:

Good evening;
Very good question indeed.
I do not know either and I never thought of it. I use a mix of 1:128 of
two-stroke oil/mogas no-lead. I installed an oxygen sensor in October 98.
I have not run the engine  much  since then, but with the spring weather,
I will begin flying soon.
I believe Tracy Crook has been using an oxygen sensor for a while and he
uses a fuel mix too. Perhaps he could tell us about his experience.
Yvon Cournoyer

If you use 100LL aviation fuel the O2 sensor will be damaged due
the lead content.

Paul

Mixing two-stroke oil is no problem for the O2 sensor.  I use it in my RX-7
car as well as the plane.

 100 LL does mess up the O2 sensor but I have found that after going back to
unleaded fuel (after a long cross country on 100LL) that the sensor does
recover, at least well enough to work with a mixture monitor.  My EFI does
not use the O2 sensor so the temporary malfunction of it is not a problem.

Tracy Crook      rws@altavista.net
Web site:   http://www.rotaryaviation.com

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