Engine oil lubricant

Mobilmet™ 420 Series

Mobilmet™ 420 Series oils are multi-purpose in nature, helping to reduce the problems associated with cross-contamination, thus improving production and reducing rejects.

Our Mobilmet 420 Series cutting oils are designed to provide effective machining performance in a wide variety of operations of both ferrous and non-ferrous metals. Since they are resistant to foaming, even with excess splashing, they are also suitable as machine tool lubricants and for use in light-duty hydraulic systems. Multipurpose cutting fluid is especially useful in screw machines, without any detriment to tooling, where cutting oil and hydraulic oil contamination occurs.

These lubricants are formulated with chlorine-free additives, which can help control the environmental impact of disposal and spillage.

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Technical resources

Features and Benefits

Features and potential benefits of Mobilmet 420 products include:

In addition to their machining performance characteristics, the Mobilmet 420 Series fluids are multi-purpose in nature which helps reduce the problems associated with cross-contamination, thus improving production and reducing rejects. They are formulated using chlorine-free additives reducing the environmental impact of disposal and spillage. The Mobilmet 420 Series fluids control built-up edge and protect the tool tip from wear. They provide improved surface finish that may eliminate the need for finish turning or forming before grinding.



Advantages and Potential Benefits

Excellent machining performance

Increased production resulting from longer tool life and reduced downtime for tool changes and wheel dressing

Improved surface finish and dimensional accuracy resulting in fewer rejects and better quality finished products

Helps increase feed rates and machine speeds

Suitable for a wide range of ferrous and non-ferrous metals and machining operations

Fewer cutting oils required, potential for reduced inventory costs

Multi-service capability

Eliminates cross-contamination problems and provides further inventory benefits

Light, transparent color

Provides a clear view of the work area at all times



Mobilmet 420 Series fluids are recommended for a wide range of machining operations on all types of metals. They can be used as multi-purpose oils when a common fluid is required for machine tool lubrication and as a hydraulic fluid assuming proper viscosity selection.


Mobilmet 423 and Mobilmet 424 are recommended for machining aluminum, magnesium and copper, brasses and bronzes and, in addition, are recommended for steels and cast irons having a Brinell hardness up to 200. They can be used for severe cutting operations of difficult-to-machine non-ferrous alloys such as silicon-copper, silicon-bronze and copper-nickel. They are very effective lubricants for the machine tool lubrication system under a wide range of temperature conditions


Mobilmet 426 and Mobilmet 427 are recommended for critical machining of non-ferrous metals and automatic operations on materials having a Brinell hardness up to about 300


Properties and Specifications







ISO 22

ISO 46

Copper Strip Corrosion, 3 h, 100 C, Rating, ASTM D130

1B (max)

1B (max)

1B (max)

1B (max)

Density @ 15 C, kg/l, ASTM D4052





Flash Point, Cleveland Open Cup, °C, ASTM D92





Kinematic Viscosity @ 100 C, mm2/s, ASTM D445




Kinematic Viscosity @ 40 C, mm2/s, ASTM D445





Pour Point, °C, ASTM D97






Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx