What Grease Cannot Be Mixed?: Essential Mixing Guide

What Grease Cannot Be Mixed?

Greases are essential lubricants used in various industries to reduce friction and wear between moving parts. However, not all greases can be mixed together. It is crucial to understand the compatibility of different greases to prevent issues such as inadequate lubrication and equipment damage.

Grease Compatibility

Some greases manufactured with synthetic base oils are not compatible with mineral oils or other types of synthetics. Mixing such incompatible greases can result in lubrication failure due to incorrect viscosities and insufficient lubrication.

Why Mixing Greases Should Be Avoided

In manuals and guidelines provided by leading grease manufacturers like Shell, Mobil, and Texaco, it is strongly advised to minimize the mixing of greases. The consensus is clear – greases should not be mixed under any circumstances to avoid potential issues.

Testing Grease Compatibility

To determine if two greases are compatible, they can be mixed in different proportions, and the mechanical stability of the mixtures can be evaluated. Any significant hardening or softening observed in the mixtures can indicate potential lubrication failure.

Grease Compatibility Chart

Various thickeners used in greases can also affect compatibility. For example, some polyurea thickeners are compatible with lithium and lithium complex thickeners, while others are not. It is crucial to refer to a grease compatibility chart for guidance.

Effects of Mixing Incompatible Greases

Mixing incompatible greases can lead to softening or hardening of the lubricant. In extreme cases, bleeding or separation of the thickener and liquid can occur, causing damage to the equipment and affecting performance.

What Grease Cannot Be Mixed?: Essential Mixing Guide

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What Grease Cannot Be Mixed?: Essential Mixing Guide

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Grease Types Compatibility

Lithium and calcium soaps are generally compatible with each other, while they may not mix well with clay-based greases. Understanding the compatibility of different grease types is essential for proper lubrication maintenance.


It is crucial to follow manufacturer recommendations and guidelines when it comes to mixing greases. Avoiding the mixing of incompatible greases can help prevent lubrication failures, equipment damage, and costly repairs.

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