Amsoil just released a engine coolant boost for sale. I'm just posting about it here, I'm not a bot.
AMSOIL DominatorŪ Coolant Boost
"Provides Effective Heat Transfer and Enhanced Corrosion Protection
Formulated with proprietary tiered surfactant technology, providing quick and effective heat transfer inside radiator and cylinder heads, which results in reduced operating temperatures, more efficient operation, increased horsepower and significantly reduced engine warm-up times in cold weather."
I'll just cut to to the warmup time they list:
Warm-up with 50/50 Antifreeze/Water Only:
30°F to 120°F: 6.3 Min.
30°F to 180°F: 11.3 Min.
Warm-up with Coolant Boost Added:
30°F to 120°F: 3.2 Min.
30°F to 180°F: 5.3 Min.
Cost is $12.05 per 16 oz bottle and it's also supposed to lower running temperature. I haven't tried it yet, but I'd like to see how it effects my Suburban since I added the CAI.