Oil-free vs oil-injected compressors: which do you need?

Oil-injected screw compressors use oil to lubricate, cool and seal the air end. They're efficient, durable and cost-effective, which is why they're the standard choice across most of industry. Good downstream filtration removes the vast majority of oil carry-over for general applications.

Oil-free compressors never let oil touch the compression chamber, delivering air certified to ISO 8573-1 Class 0 — effectively zero oil. This matters where any contamination is unacceptable: pharmaceuticals, food and beverage, electronics, medical and similar processes.

Oil-free units cost more up front and per unit of air, so they're not the default — they're the right answer when air purity is critical to your product or to regulatory compliance. If oil contamination would spoil your product or breach a standard, choose oil-free; otherwise oil-injected is usually the better value.