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. 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.
R134a PAG Oil Change Procedure Steps
Identifying the Correct Viscosity Not all PAG oils are created equal, as they are available in different viscosity grades to suit various system designs and climate conditions. PAG oil is hygroscopic, meaning it absorbs water from the air.
The viscosity determines how easily the oil flows and how well it maintains a film between moving parts. It is vital to avoid exposing the PAG oil to moisture for extended periods.
Step-by-Step R134a PAG Oil Change Procedure
Old oil can become contaminated with metal shavings or moisture, reducing its effectiveness. Visible debris or sludge exiting the compressor when it is removed for inspection.
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