We were recently on a tool forum where the question was asked ” what is the difference between oil-free and oil-lubricated air compressors?” This is a good question so we decided to post what we consider to be a thorough answer!
Oil-free compressors have pumps that are directly linked to the motor. A teflon-coated cylinder sleeve and piston ring result in very little friction between the Teflon parts, eliminating the need for oil. Some advantages of oil-free design are no messy oil spills, cleaner output air and no maintenance except for intake air filter. The teflon piston ring and cylinder are easily and economically replaceable resulting in extended compressor life. Oil-free compressors are also lighter in weight.
Oil-lubricated compressors have pumps that use an aluminum crankcase and head for improved heat dissipation, cast iron cylinder sleeves, and automotive style pistons and compression rings. Some advantages of the lubricated design include aluminum components that are noncorrosive, lightweight and improve heat dissipation. Of course, this pump does require oil and some maintenance. There you have it, now the choice is yours!
Hi,
Great little sum up of the difference between oil-free and oil-lubricated.
Might I add that we would always recommend lubricated compressors. Yes they are a bit more messy (especially if its a little compressor and it falls over!) and require you to maintain the oil level. However they are far more reliable and not as noisy. We see a lot more oil-free compressors come in for repair than lubricated. So the extra effort in keeping it oiled is definatley worth it from our experience!
I hope that helps.
Kind regards
George Thomas
Air Supplies
http://www.airsupplies.co.uk
Appreciate the blog. One follow up. It feels like from the description that buying the oil free gives you the performance while avoding the hassle of the oil version. When and why would someone buy the oil version over the oil free? Thanks.
I appreciate the write up but wondering which would last longer? I have an oil free one at the moment and in the market for a new compressor. Seems the oil compressor would be more durable, no?
Oil compressor tend to last longer and are more heavy duty. They are hard to get working when it is cold outside.