The majority of manufacturing, industrial and small workshops prefer to use oil injected compressors,
since the consequences of oil contamination are not as great as they would be in a food production or pharmaceutical for example.
If there is no immediate need for oil-free compressed air, the more economic way is to go with an oil lubricated unit.
However, the traces of oil in compressed air can be cleaned up further by utilizing proper quality air products.
The use of coalescing filters can clean the compressed air, which can further be cleaned by adding a carbon activated filter to get close to Class 1 air purity.