I've been using this diaphragm micropump for many years in a few of my products: When it works, it works well. Lately, I've had problems with the ball bearing seizing up -- generally when the pump is exposed to cold temperatures. What I think is happening is that moisture is condensing on the bearing, causing oxidation and ultimately failure. A squirt of lubricant makes the pump work perfect again -- regardless of temperature (i.e. expansion and/or contraction is not causing the problem). So I want to lubricate the bearing before installing the pump. I need a low viscosity lubricant that will resist moisture long term, and not collect dust/dirt. This is not a field-serviceable item, so I need the lubricant to last. It also needs to be compatible with the plastic (ABS) housing and rubber diaphram. Any ideas?