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PAG Compressor Oil: What It Does, and What It Costs You
Classification: Company News
Nov 13,2026
Why PAG?
Most rotary screw failures begin with varnish: oxidised oil deposits on rotors, coolers and separator elements, heat transfer falls, discharge temperature climbs, and the oil ages faster.
PAG (polyalkylene glycol) interrupts that chain. Its molecules are strongly polar, so oxidation products stay in the oil rather than baking onto hot metal. Viscosity index is typically above 150, so the film holds from cold start to full load. And low hydrocarbon solubility means less gas dilution in process-gas service — the ISO VG 32 or 46 you specified is closer to what the bearings actually see.
How long between changes?
On OEM-approved rotary screws with clean inlet air and controlled discharge temperature, PAG compressor oil commonly runs 8,000–12,000 hours. Mineral oil in comparable service lands at 2,000–4,000.
Ranges, not promises: every 10 °C of extra discharge temperature roughly doubles the oxidation rate.
Three checks before switching
- Moisture. PAG is hygroscopic. Sealed storage, condensate control and routine water testing belong in the specification, not in a maintenance habit.
- Mixing. PAG is not miscible with mineral or PAO oil — blending can gel or precipitate sludge. Full flush, new filters and separator.
- Materials. Nitrile and fluoroelastomer seals are usually fine; paints, coatings and some engineering plastics are not. Work from the OEM list.
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