Look at the specs on Woodland Pro Synthetic. Not too impressive looking numbers huh? Well, it protected a stock MS441 used extensively for milling with the carb limiters intact, and no muffler mod to let the heat out. There were LOTS of signs of heat, but no scoring. That'll tell you just how much we're overthinking this, myself included.
Woodland Pro synthetic- http://www.baileysonline.com/msds_sheets/PDFs/wp_synthetic.pdf
performance additive = 5-12%
high flash solvent = 22-27%
base oil - synthetic = 45-57%
Blue Dye = ~ .5%
Low smoke additive = 30-40%
fuel stabilizer - less than 2%
Flash Point = 210F
Visc @ 40c = unknown
Visc @ 100c = 7.2