09/11/2026 by Joel Thompson
Using the incorrect lubricant in industrial machinery can result in many unwanted outcomes. These include accelerated wear and tear, excessive heat, poor efficiency, seal damage, a build-up of sludge and, in extreme cases, total mechanical failure.
From gas engine oil made by Mobil to grease from Petronas, industrial lubricants are engineered to perform specific tasks under clearly defined operating conditions.
As a result, a lubricant that works correctly in one piece of equipment may be entirely unsuitable for others, even if the products seem similar. Any differences in base oil, viscosity, additives and application can substantially influence how a product works.
Often, undesirable impacts go unnoticed, as the consequences of combining incompatible oils are not always instantaneous. Equipment may keep running after the wrong lubricant has been used, while damage slowly develops inside moving parts like bearings and gears.
As such, understanding when and how to act when the wrong lubricant has been added to equipment is critical. Here, we explore the best practices for machinery operators and maintenance teams that encounter this issue, and answer commonly asked questions on steps towards protecting equipment and returning it to effective and safe operations.
The wrong lubricant is in the equipment. What do you do now?
The seriousness of adding the wrong lubricant depends on several factors. These include the oil or fluid that should have been employed, the equipment involved, how much incorrect lubricant has been added and whether the lubricated machine has since been operated.
Should the machine be stopped immediately?
Machinery should typically be stopped instantly if an incompatible lubricant is erroneously added, especially when heavy vibration, unusual noises or temperature spikes occur.
How serious is it if only a small amount of the wrong oil was added?
If just a small amount of an incorrect oil was introduced, the severity of the situation is heavily impacted by the chemical composition and application type.
Even a small percent of a chemically incompatible product can trigger foaming, additive fallout, sludge formation and weakened film strength. In high-speed, high-load or precision machinery applications, even minor deviations can decrease protective films and accelerate wear.
What information do you need about the correct and incorrect lubricants?
When a lubrication error occurs, note down the two lubricants involved, the exact quantity of incorrect lubricant added, what equipment was impacted and just how long the machinery has operated after.
Can the machine continue operating?
When it is operationally appropriate and safe to do so, stop the equipment to prevent the wrong lubricant circulating any further. Ensure you adhere to established shutdown and isolation procedures.
Does the lubricant need to be drained?
After the machinery has been stopped, operators should contact their lubricant distributor, equipment manufacturer or another appropriate technical expert for guidance. They may advise draining, flushing, monitoring and sampling, depending on the severity of the circumstances.
Does the entire system need flushing?
Flushing is not always required if the wrong lubricant is employed. However, it is necessary when products are incompatible, when a substantial amount of incorrect lubricant is added, when machinery has been running for a considerable period of time or when equipment is especially sensitive.
Should filters be changed?
If a drain and flush is deemed necessary, filters and seals should be replaced to avoid any contamination to the fresh supply of correct lubricant. When taking advice from the equipment manufacturer, they can offer guidance on whether this step is a requirement.
What warning signs should be monitored afterwards?
There are many indicators to watch for after the wrong lubricant has been used. These include increased lubricant consumption and operating temperatures.
Changes to how the machinery performs can also be a strong sign. More obvious indications include unusual vibrations, noises and oil leaks. Other signs are more often spotted during maintenance, like sludge and deposits, foaming and blocked filters.
How to prevent the wrong lubricant being used
Companies using a range of different lubricants can take steps to reduce incorrect lubricants being used.
Where lubricants are stored, each product should be clearly labelled to minimise confusion. To avoid any cross-contamination, each lubricant should have its own dedicated filling equipment.
Maintenance records should be well-maintained and state the name of the specific lubricant used for each item of machinery on site. To ensure the correct lubricants are being used, operators should always consult the original equipment manufacturer’s list of approved lubricants.
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