Update 1/18/21
This LIFT fluid leak is now also showing up in 2021 C8 Models
Used is DOT4 Brake fluid
This fluid is seen covering many areas of left front, including found on left front coilover and shock
Brake fluid ruins lots of things including surfaces like plastic as caustic
Bad design where the pressure is causing the pinhole in bladder under the fill cap to spreading crack allowing more volume of fluid
to be pushed through the small relief path see under the cap
Those who received a new cap and bladder in short timeframe then also allowed fluid to be pushed out of cap
Some owners forced to wrap rags around fill cap to at least prevent fluid flowing all over and even seldom use of LIFT system fluid is seen leaking
GM needs to redesign this but in mean time either limit use of LIFT and if ordering a C8
suggest not buying this option until a new design has been done and proven not to leak