I was not happy with my current, recommended, choice of lubricant (Dumonde Tech Lite), especially in very cold temperatures. My XCS gimbal became stiff at first and needed to be loosened up by moving it around a couple of times.
So I did some research and ended up trying out the following bearing lubricant, with great success.
It's called: Muchmore Spin Lube Bearing MMRC3506
very, very low friction, compared to before
this is the actual product they use: