I think your making a big deal about nothing.
Hey, all you guys who want to talk about how hot your mufilers get: don't be stupid! Mufflers get HOT! Exhaust gas leaving the head can reach well over 1000°!!!! Doesn't matter what oil you run. Don't go touching mufflers! Don't waste time measuring muffler temps. That's not where we measure engine temp. Exhaust temp varies by load, and isn't affected too much by engine core temp. (Oh, it is a little.) But exhaust temp can swing from 350° under no load, to upwards of 1200° under load. Stop touching mufflers. Stop talking about muffler temps. If you're muffler is getting hot enough to glow, either your fuel system is way lean, or the muffler is worn out.
The only way to truly know how hot your engine is running on an air cooled motor, is to monitor oil temperature. Which, you can't do visible, or with an infrared gun. Just, run your engine with whatever oil and don't worry about it. If it's running too hot, it's likely running too lean.
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