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Check the machine’s manual before choosing a lubricant. There is no single best oil or grease for every machine: the correct product depends on the equipment, the lubrication point, operating conditions, and the manufacturer’s specification. Using the wrong product—or applying the right one in the wrong place—can undermine maintenance and create safety problems.
For construction equipment and shop machinery, start with the specified lubricant and maintenance procedure. Then consider how and when it can be applied safely, and whether the machine’s work involves metal cutting or grinding that calls for a metalworking fluid.
How to choose a lubricant for a machine
- Identify the lubrication point. A bearing, chain, gear, slideway, or metal-cutting operation may have different requirements. Do not assume one product suits every point on a machine.
- Find the machine maker’s specification. Check the operator’s manual, maintenance schedule, or service documentation for the required lubricant and application instructions. Follow the supplier’s product guidance as well; generic machine oil, grease, or penetrating spray is not a substitute for a specified product.
- Account for operating conditions. Use the conditions named in the equipment documentation, such as the application and service environment, to choose among products that meet the specification. The sources cited here do not establish a universal viscosity or formulation for machinery.
- Plan a safe application method. Follow the machine’s maintenance and guarding procedures. For machinery covered by OSHA’s general-industry mechanical power-transmission rule, the regulation says, “Machinery shall be oiled when not in motion, wherever possible.” OSHA 29 CFR 1910.219(p)(7)
Oil or grease: which should you use?
Use the type specified for the particular lubrication point. Oil and grease are not interchangeable simply because both reduce friction. The machine’s manual or service guidance is the deciding reference; the available OSHA sources do not provide a general rule for choosing between them across all machine types.
Also avoid over-lubricating. OSHA’s mechanical power-transmission rule says shafting should be kept free of excess oil or grease. Apply the amount and at the interval in the equipment’s maintenance procedure, rather than adding lubricant as a precaution without guidance. OSHA 29 CFR 1910.219
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Metalworking fluids: lubrication and cooling for machining
If the work involves cutting or grinding metal, the relevant choice may be a metalworking fluid rather than a general-purpose mechanical lubricant. OSHA groups these fluids into four classes: straight oil, soluble oil, semisynthetic, and synthetic. The categories apply to metalworking fluids; they are not a classification of every oil and grease used in machines. OSHA’s Metalworking Fluids: Safety and Health Best Practices Manual
| Metalworking-fluid class | General use and trade-off |
|---|---|
| Straight oil | Used neat, generally where lubrication is the priority over cooling. |
| Soluble oil | Water-miscible and diluted before use; can support both lubrication and cooling. OSHA describes trade-offs among metalworking-fluid classes, so suitability depends on the operation and product guidance. |
| Semisynthetic | Water-miscible and diluted before use; can support both lubrication and cooling. Select for the operation using the fluid supplier’s guidance. |
| Synthetic | Water-miscible and diluted before use; can support both lubrication and cooling. Select for the operation using the fluid supplier’s guidance. |
For a metalworking operation, compare its need for lubrication versus cooling, whether the product is used neat or diluted, corrosion protection, residue and cleanliness, and the fluid’s maintenance requirements. Use the product’s instructions for dilution and upkeep; a fluid class alone does not determine the right choice. OSHA’s Metalworking Fluids manual
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Lubrication safety around machinery
Lubrication is one part of machinery care; correct alignment and adjustment also matter. Keep application within the machine’s maintenance procedure and do not bypass guards or reach into hazardous areas to lubricate equipment.
OSHA describes a way to reduce exposure to hazardous areas: locate an oil reservoir outside a guard and route a line to the lubrication point. Whether a particular machine can use this arrangement depends on its design and approved maintenance method. OSHA’s machine-guarding safety considerations
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For metalworking fluids, manage exposure and fluid condition
Metalworking fluids can cause adverse effects through skin contact and inhalation of mist or aerosol. OSHA advises obtaining the product’s safety data sheet (SDS), maintaining fluids as needed, and reducing mist and splash exposure. Apply those controls alongside the equipment maker’s instructions and applicable workplace procedures. OSHA guidance on evaluating metalworking-fluid exposure OSHA’s Metalworking Fluids overview
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical maintenance checklist
- Confirm the lubricant and lubrication point in the machine’s manual or service documentation.
- Use the product according to its supplier guidance; for metalworking fluids, follow the directions for neat use or dilution and routine maintenance.
- Check the SDS for workplace handling information when using metalworking fluids.
- Apply lubricant using the machine’s approved maintenance and guarding procedure; where possible for machinery within its scope, OSHA’s rule calls for oiling while the machinery is not in motion.
- Use only the prescribed amount and keep shafting free of excess oil or grease, as OSHA’s rule specifies.
OSHA’s mechanical power-transmission regulation applies to the equipment and workplaces within its scope; its machine-guarding eTool and metalworking-fluid manual provide safety guidance, not a universal lubricant specification. Follow current equipment documentation and applicable workplace rules for the machine being serviced.
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