The air compressor is dependent on a compressor oil separator for quality. The oil is what lubricates the moving parts, and the better your separator is, the better it performs. The oil will also prevent serious damage to the moving parts that are caused by dirt. This makes for a safer machine, and less chance of major damage due to the fine particles the oil may trap. Because of this, you want a quality separator that will keep up with the demand for oil throughout the life of your machine.
There are many different separators on the market. You want to make sure you get a separator that will perform well and handle the pressures you are dealing with. The best separators for air compressors are steel, and this is the type that are available in both grid-and-drop styles. Grid-and-drop separators are smaller than most other styles, but not necessarily less powerful. Their smaller size can make them a little more difficult to find, but they are generally more durable and perform well.
The other option is a gas-dispensing separator. These are the most popular separator for air compressors because they work well under all kinds of different conditions. There are different ways to build a grid and drop separator that will work well for you. The simplest way is to build one from scratch, and it may be the most cost effective. The disadvantage of this option is that you have to purchase the parts separately. If you are able to find a company that offers it as part of their package, that would be a good choice. The advantage of this type of separator is that you have it built in, and it is compact.