Amsoil's Shock Therapy Suspension Fluid #5 Light does have a viscosity that is comparable to the average of other 5W fork oils: 4.4 cst @ 100°C, and 15.7 @ 40°C.
Amsoil Medium #10 (10W): 7.3 @ 100°C, 32.1 @ 40°C.
http://www.peterverdonedesigns.com/f...ion%20oils.pdf
Forks typically operate at about 26°C (78°F) in 21°C (70°C) ambient temperatures...