KnowledgebasE Article

Comparing PAG and PAO-based lubricants

Polyalkylene Glycol (PAG) lubricants are an excellent choice for a wide range of equipment, offering several advantages over PAO (Polyalphaolefin) and mineral-based fluids. We’ve created a guide on the benefits of PAG lubricants, compatibility considerations and advice for changing from mineral oil or PAO-based lubricants.

PAG lubricant advantages over PAO

  • Unmatched thermal stability: PAG lubricants have an impressive resistance to thermal breakdown, making them ideal for high-temperature environments.
  • Leading lubricity performance: PAG lubricants provide superior lubrication, reducing friction and wear and extending the lifespan of your equipment.
  • Outstanding energy efficiency: PAG lubricants’ friction-reducing properties lead to optimal gear operation and significant energy savings.
  • Extended oil life: PAG lubricants have superior oxidation resistance, allowing for longer intervals between maintenance.
  • Consistency in all climates: PAG lubricants maintain viscosity in all weather conditions, ensuring seamless equipment performance.
  • Green and clean: PAG lubricants are biodegradable and eco-friendly.
  • Superior protection: PAG lubricants have superior film strength compared to PAO fluids, protecting gears and bearings from wear and tear.
  • Moisture resistance: PAG lubricants are stable even in humid or wet environments, minimising the risk of hydrolysis.
  • Long-term savings: The benefits of PAG lubricants, including reduced maintenance and longer machinery life, result in significant long-term cost savings.

Compatibility considerations

PAG lubricants are not compatible with PAO or mineral-based lubricants. Mixing PAG lubricants with other lubricants can lead to separation and reduced efficacy. Always flush the system thoroughly when transitioning between different lubricant types.

How to change from mineral oil or a PAO-Based Lubricant to a PAG lubricant

  1. Ensure the equipment is at its normal operating temperature.
  2. Thoroughly drain the old lubricant from the equipment.
  3. Check reservoirs, lines, and other areas where oil may be trapped, ensuring they are completely emptied.
  4. Fill the system with the new PAG lubricant to flush it.
  5. Once flushed, drain this lubricant out of the system.
  6. Refill the system with fresh PAG lubricant.
  7. Caution: Seals previously in contact with mineral oils may shrink when exposed to the new PAG lubricant, causing oil leaks. Consider replacing these seals if necessary.

While PAO and mineral-based fluids have their strengths, the standout benefits of PAG are hard to overlook. Consider PAG lubricants for your machinery for optimal equipment performance and long-term savings. Contact us today to learn more.