Signs of Degradation or Failure A system suffering from degraded PAG oil will exhibit specific symptoms that alert the user to a problem. However, it also serves to carry heat away from the compressor and helps to seal the internal components by maintaining the flexibility of the seals and hoses.
How to Choose the Right R134a PAG Oil Grade for Your System
During a recharge, the new oil is usually injected into the system via the low-pressure service port before refrigerant is added. Chemical Compatibility and Function Polyalkylene glycol, or PAG oil, is the synthetic lubricant of choice for R134a refrigerant systems.
Among the various refrigerants used historically, R134a remains a common standard in many vehicles, necessitating the use of a compatible PAG oil. Viscosity Grade Common Application Climate Consideration PAG 46 Most standard automotive A/C systems Moderate temperatures PAG 100 High-pressure or performance systems Hot climates or heavy use PAG 150 Heavy-duty or industrial applications Extreme heat or high load Technicians must refer to the vehicle’s service manual to determine the exact viscosity required.
Choosing the Right R134a PAG Oil Grade for Your System
It is vital to avoid exposing the PAG oil to moisture for extended periods. Keeping the oil capped and stored in a dry environment before use is a standard professional practice.
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