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How long is the typical service life of PAG synthetic oil?
The service life of PAG synthetic oil in compressors is generally 8,000–12,000 hours under normal operating conditions, equivalent to 3–5 years of service.
Under severe working conditions such as high temperature and heavy gas dilution, the service life is reduced to about 4,000–6,000 hours.
- Typical service life by equipment
Screw compressors for natural gas, LPG and chemical gas
Normal condition: 8,000–12,000 hours / 3–5 years
High exhaust temperature & heavy hydrocarbon dilution: 4,000–6,000 hours
Refrigeration compressors & HVAC / vehicle A/C compressors
Automotive air conditioning: 2–3 years / 40,000–60,000 km
Industrial screw & centrifugal refrigeration compressors: 6,000–10,000 hours / 3–4 years
Reciprocating compressors for high-pressure gas, ammonia and acid gas
Standard condition: 6,000–10,000 hours
Service with H₂S and corrosive gas: 3,000–5,000 hours
Vane compressors & CO₂ process gas centrifugal compressors
Stable-load centrifugal units: 8,000–15,000 hours
Vane compressors: 6,000–10,000 hours
2. Key factors affecting service life
Temperature (the most critical factor)
If oil temperature exceeds 90°C, the service life will be reduced by about 50%. The oxidation rate roughly doubles with every 10°C temperature rise.
Gas dilution
Dissolved gas such as natural gas and propane reduces oil viscosity and accelerates oil oxidation and deterioration.
Moisture content
PAG oil is highly hygroscopic. Excessive moisture causes hydrolysis and sharp rise of acid value.
Contamination and solid particles
Dust and metal debris accelerate wear and oil oxidation, greatly shortening oil life.
Incompatible oil mixing
Mixing PAG oil with mineral oil or PAO oil will cause sediment and rapid deterioration, even in small amounts.
3. Oil replacement criteria
Replace the oil immediately if any of the following occurs:
Total Acid Number (TAN) increases by more than 1.0 mgKOH/g compared with new oil
Viscosity at 40°C changes beyond ±15%
Water content exceeds 200 ppm (＜100 ppm for refrigeration systems)
Obvious darkening, turbidity, peculiar smell or sludge formation
4. Summary
Clean, low-temperature and low-dilution working conditions: 3–5 years / 8,000–12,000 hours.
Continuous high temperature, heavy gas dilution and corrosive environment: 1.5–3 years / 4,000–6,000 hours.
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https://niubortec-lubricant.com
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Foshan City Chancheng District Xiyue industrial zone 4 row 2, China
Foshan City Chancheng District Xiyue industrial zone 4 row 2, China
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