"Thomas Borchert" wrote in message
...

Uhm, no, not at all. He'd have to be concerned to run not lean enough,
actually, since the temps decrease again when running leaner and leaner.

....and the effects of increased oxidative attack on the exhaust negates the
so-called advantage of low temps. In addition, TBO advisor adds that "very
little cooling effect is coming from the fuel itself, so CHT does not
respond in quite the same way you'd expect." Running lean of peak also
results in reduced performance, rough engine operation in many cases and
shortened TBO due to the above-mentioned oxidative attack of exhaust and
combustion chamber components. Running lean of peak also has another side
effect, increase in oil acidity, which causes oxidation in engine internal
components (same thing happens if you don't operate the engine often enough
to burn off any condensation in the oil). At lean of peak, exhaust gases
are rich in oxides of nitrogen, which mix with moisture to create nitric
acid, which happens to be extremely corrosive. In addition, TBO Advisor says
there is direct evidence documenting a relationship between ntric acid and
camshaft wear. Because of this, they recommend that if you're going to
operate your engine at best economy mix, lean of peak, then change your oil
every 25 to 50 hours (preferably closer to 25). This method is specifically
not recommended for TSIO-360 series, O-470 and IO-470 series and several
other series and models of engines.