Environmental Envelope

[underfire]

Just to give you an idea of the viscosity differences with temperature, the is AeroShell 4 Fluid:

Kinematic viscosity mm²/s

@ 100°C 4.0 min 5.30
@ 40°C 13 min 14.1
@ –40°C 500 max 491
@ –54°C 3000 max 2300