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Another bad consequence of running fluids through the frame tubes is the different expansion rates of the tubes with hot fluid in them, causing frame distortion and weight jacking across the wheels, resulting in uneven braking and cornering loads.
Suspension set-ups need to be done with all the fluids up to temp, and then hope for the best on the track!
Kind of defeats the purpose of designing a stiff chassis as a constant suspension platform. Basically this is why the fluid in chassis tubes was retired to 'Oh yeah!' file.