How? I understand certain additive packages not breaking down as quickly, but how can the oil retain less heat?

Lest friction = less heat so I get that part already.

Interesting thread. I had my car dynoed today and I'm running Mobil 1 and even though the temps were in the upper 60s, after a few dyno pulls, the oil temp was around 220 and after 20 minutes to let the car cool....the oil temp only came down about 5-10 degrees. My tuner was kind of curious about it.