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Product Data
castrol.com/GPS
800 255 4417
May 2025
GPS
Castrol
®
Magna
®
PG
Castrol Magna™ PG is a range of polyalkylene glycol based compressor
lubricants, formulated expressly to lubricate gas compressors. e ability
to withstand dilution by dissolved hydrocarbons allows these lubricants
to give excellent protection in oil-flooded screw compressors and in the
cylinders of reciprocating compressors.
e formulation provides better viscosity retention due to its high viscosity
index and increased resistance to hydrocarbon dilution, compared to
mineral and polyalphaolefin variants. It contains additives to protect
equipment from wear, rust & hydrogen sulphide corrosion.
To select the optimum viscosity variant, a number of factors need to be
considered, including:
• e composition of the gas being compressed
• e operational expectations of the compressor
• e Original Equipment Manufacturer's (OEM's) viscosity requirements
at the maximum temperatures for the lubricated components
Please consult your Castrol technical service engineer with this information for assistance.
Features and Benefits
Magna PG compressor oils can provide the following key advantages compared to mineral and
polyalphaolefin (PAO):
• Viscosity retention
• Longer compressor life because of improved film strength
• Reduced wear leading to increased operational reliability
• High viscosity index will contribute to improved lubrication and reduced wear, especially at
elevated temperatures
Application
• Cylinder and Gland Packing lubrication of reciprocating compressors
• Oil flooded rotary screw compressors
H6
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