02/11/2026 by Daniel Tait
Most industrial equipment typically ships with an accompanying machine manual. Today, these may involve hard-copy printed guides or digital resources like PDFs.
While comprehensive manuals will usually specify suitable lubricants that work effectively to maintain their moving parts, in some cases, more detailed information is omitted. This can be because of poor documentation, but it can also be caused when details are delegated to a separate component manual.
In this article, we offer a practical guide to help maintain industrial machinery when the companion manual does not state the preferred lubricant to use.
Identify the component
The first step is to record the component that requires lubrication, like bearings, gearboxes, slideways, spindles and chains. This can help narrow the field, as many parts have lubricants dedicated to them specifically, such as slideway or spindle oils, for example.
What are the main factors that impact lubricant choice?
After identifying the component being lubricated, you need to assess how it works. This includes operating conditions like load and speed.
For example, heavy loads need a higher viscosity lubricant or specific extreme pressure (EP) additives to maintain a robust film, while high-speed and low-torque systems need lower viscosity oils for continuous circulation and cooling.
Lubricants should also be matched to operating temperature ranges and whether machinery is used intermittently or continuously.
Finally, the operating environment must be considered, and a lubricant selected that can cope with moisture, contamination or dust.
When to use grease, oil or a dry lubricant
Three common types of lubricant include oils, greases and dry lubricants.
Oil-based lubricants are the best choice for fast-moving components and high-speed operations when cooling and debris flushing is required. They also suit circulating systems and machinery with tight spaces.
Grease, on the other hand, works best for slow- to moderate-moving machinery and heavier loads, as well as machinery in corrosive or wet environments.
Dry lubricants are suited to dusty and dry conditions, at extreme temperatures when other lubricants might freeze or burn and in clean-sensitive environments.
Why is viscosity important when selecting a lubricant?
Viscosity is key because it determines the lubricant’s resistance to flow. This directly controls its capacity to form a protective film in between moving parts and protect against wear. However, it should not be used in isolation, as other factors beyond viscosity can impact performance, like the base oils and additives used in its formulation.
Why lubricant compatibility is key
When choosing a suitable lubricant, it is vital to understand all the materials present in the equipment. While metal is a key element of industrial machinery, other components may be manufactured from rubber and plastic, like seals. To avoid system damage, the lubricant you select must be compatible with all component materials.
Can you just use a general-purpose lubricant spray?
While a workshop-grade oil or grease spray can provide some level of lubrication, it may not be sufficient for long-term use. Identifying an effective lubricant to serve machinery is the only acceptable course of action.
Points to check when the manual is unclear about lubrication
Information that can help identify appropriate lubrication may be at hand in the form of existing lubricant labels on machinery or the equipment’s data plate.
Manufacturer documentation may also include recommended lubrication, and some lubricant brands provide lubrication charts that list the machinery their products are compatible with. Check these details first so you can share them if you wish to seek out technical support from a lubricant supplier or equipment manufacturer.
Best practices when correct lubricant specifications cannot be confirmed
When it is not possible to confirm the best lubricant for an application, operators should never simply guess at an appropriate solution. Making an informed decision is essential to ensure smooth operation and optimal performance and to safeguard the equipment from mechanical wear, overheating, contamination, corrosion and both long- and short-term damage.
Valuable sources of advice include original equipment manufacturers (OEMs), specialist lubricant distributors and leading lubricant makers like Castrol and CPI Fluid Engineering, among others.
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