It sounds to me these grease pot additions are a joke in itself and more problems than what they're worth....Nothing more than a marketing gimmick?
There are three common types of compressed air dryers: refrigerated compressed air dryers, membrane compressed air dryers and desiccant compressed air dryers.
* Refrigerated dryers-----Are used in heavy use operations where the compressor runs constantly in a shop environment. consist of an air-to-air heat exchanger and an air-to-refrigerant heat exchanger. If the shop temperature is high and or humid, these are the best. Take out a mortgage for these units, very expensive.
* Desiccant dryers----These are great for the release of moister buildup if a drain valve is attached at the bottom. These units are a must to use outdoors on a construction site in cold weather months. In the past, I have had my hoses and nailers freeze up.
* Membrane dryers---- Membrane dryers use highly selective membranes to dry the compressed air. They are able to achieve pressure dew points between +15 and -40 °C and are therefore widely used for a wide range of application. Take out a mortgage for these units, very expensive.
Ambient room temperature is key when filling your units. Nothing will last forever, even if you take out a mortgage to do so.....It's your money!