It is not uncommon for five horsepower air compressor pricing to range from less than $750 to near $2000. The difference can be measured in compressor life, sometimes as short as 2000 hours versus 40 years for a heavy duty pressure lubricated compressor. While the upfront cost is attractive, it would seem the maintenance would involve throwing away the lesser air compressor every year or so and replacing it with a new machine. Even if it were planned to keep the air compressor and perform a rebuild, it may not be possible with less costly air compressors.

The consumption of special parts and oil also must be considered in the cost of ownership. It is typical for manufacturers of rotary screw dental air compressors to provide a long-life synthetic fluid to enhance the performance of the air compressor. Synthetic oils will last from 4000 hours to an indefinite period before requiring a change-out.

Depending on the type of fluid used, special handling and disposal might be required. For example, normal motor oil, which is rarely used in any type of air compressor, can be easily discarded without being considered a hazardous waste. Automatic transmission fluid, which will last about twice as long and reflects that in its price, can similarly be disposed of fairly simply. Both types of fluid are collected routinely by oil recyclers to be re-blended.

Synthetic fluids and blends, however, sometimes require special handling for proper disposal. Ester and olefin type fluids must be identified and require special disposal in some municipalities. It is best to check before buying to ensure all costs are factored.

Other types of fluid are considered to be biodegradable, and thus suitable for disposal in a sewer system. Such fluids, polyalkeneglycol or polyglycol, should have a certificate from the manufacturer that states the fluid’s biodegradability.

Other specialty chemicals like silicon blends or pure silicon represent another disposal issue and should be disclosed prior to purchase. Note that the more features a fluid has, like long life and high temperature stability, the more expensive it will be to buy and discard.

By carefully selecting an air compressor that has a balance between long service life and parts cost, it is possible to save even more money over the life of the equipment. Also, by weighing the maintenance requirements, the impact of waste filters and fluid can be managed as well. Less cost and less waste is better for the economy and ultimately is better for the environment.