Originally Posted by
silversx80
No such thing... that's what happens when you let marketing into engineering.
Over time using the trainer will mean the chemical composition in the fluid solution will break down, and will be less "thermodynamically neutral". Temperature stability will only be within an upper and lower range of temperatures, and speeds. Outside those ranges the fluid is not "thermodynamically neutral", and those ranges will become narrower due to use.
That said, the trainer will be consistent day-to-day, and workout-to-workout. However, if you were to plot the in-ride power against a strain-gauge-based power measurement, you'd find that the in-power is less accurate season to season.
I think you are blindly arguing against the actual physical properties of liquid silicone without actually knowing anything about the material.
Liquid silicone has exceptionally high heat resistance, exceptionally low thermal conductivity, high viscosity stability (through large temperature changes), and "extremely high" shear stress resistance.
What do all of these properties mean?
Over the life of a fluid trainer, used within it's normal trainer duties, the fluid will not break down, and it's viscosity over the course of a workout will not affect power readings.