The LCN closer fluid "Liquid X" will perform without variation between:
-30° F to +120° F - for manual closers.
+35° F to +120° F - for electrical closers and automatic operators.
At around ...
No. As of June 27th, 2018--- the cover screw is now standard in the screw packs for the 4040XP, 4040XPT, 4000T, and 4040SE so ST-3596 is no longer needed.