Refrigeration Compressor Lubricants

Mobil Zerice S Oils are premium quality synthetic refrigeration compressor lubricants based on alkyl benzenes, which due to their nature, have superior miscibility with hydrochlorofluorocarbon (R22). This allows them to be used in very low temperature applications, down to -60°C. In certain circumstances, they can also be used in compressors where ammonia acts as the refrigerating fluid.

Features, Advantages and Benefits

Relative to mineral and other synthetic lubricants, Mobil Zerice S has superior solubility with halocarbon refrigerants. This helps avoid the common problem of oil separation and congealing on the valve and heat transfer surfaces of the refrigeration system.

Additionally, Mobil Zerice S lubricants have very low pour and floc points which helps prevent harmful wax precipitation that can block expansion valves and heat transfer surfaces.

The synthetic nature of Mobil Zerice S lubricants provides excellent chemical stability which resists reaction with refrigerants, as well as high thermal stability which helps prevent oil breakdown.

Features Advantages and Potential Benefits
Miscibility with halocarbon refrigerants Increased system efficiency
Low pour and floc points Avoids wax precipitation and increased system efficiency
Chemical Stability Long oil service life


Mobil Zerice S lubricants are recommended for all refrigeration compressor types: reciprocating or rotary screw. They are well suited for use with hydrochlorofluorocarbon refrigerants, and may also be suited for use with ammonia in certain equipment builders’ compressors. They should not be used with sulfur dioxide or R134A refrigerants. The specific viscosity grade should be selected in accordance with the compressor manufacturer’s recommendations.

Typical Properties

Mobil Zerice S 32 46 68 100
Viscosity, ASTM D 445        
cSt @ 40ºC 32 46 68 100
cSt @ 100ºC 4.2 5.4 6.5 8.0
Pour Point, ºC, ASTM D 97 -33 -30 -27 -27
Flash Point, ºC, ASTM D 92 154 154 174 186
Floc Point, R12, ºC -60 -60 -60 -60
Acid Number, mg/KOH, max., ASTM D 974 .05 .05 .05 .05
Copper Corrosion 3 h, at 100ºC, ASTM D 130 1 1 1 1
Water Content, ppm, ASTM D 1533 ‹30 ‹30 ‹50 ‹30

Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS’s are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.


It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.