Most plants hand lubrication to the newest person on the crew and call it PM. That's backwards. Wrong grease, too much grease, dirty oil and missed intervals cause bearing and gearbox failures that the whole maintenance department ends up chasing. Lubrication technician certification from the International Council for Machinery Lubrication (ICML) gives that work a standard, and gives you proof that you can do it right. This guide compares ICML's two entry-level credentials, MLT I and MLA I, and helps you pick between them.
What ICML Lubrication Certification Is
ICML is the main certifying body for machinery lubrication. Its certification page lists a family of credentials, including:
- MLT I and MLT II: Machine Lubrication Technician
- MLA I, II and III: Machinery Lubricant Analyst
- LLA I and II: Laboratory Lubricant Analyst, for people working in oil labs
- MLE: Machinery Lubrication Engineer
Plant maintenance techs nearly always start with MLT I or MLA I. The lab and engineer tracks suit different jobs.
You can take ICML exams two ways: a secure online exam proctored from your own location, or a proctored session at a scheduled site. ICML says the certification fee is the same either way, so pick whichever is easier. Its exam page doesn't list the actual fee, so check the Costs tab before you budget.
MLT vs. MLA: The Real Difference
The simplest way to remember it:
- MLT covers getting the right lubricant into the machine, in the right amount, at the right time, without contaminating it.
- MLA covers checking the lubricant's condition: pulling good samples, understanding oil analysis results and acting on them. It also covers a lot of the hands-on lube work.
There's overlap. ICML describes MLA I as checking whether technicians can handle lubricant storage and dispensing, re-lubrication routes, oil changes, lubricant and grease selection, regrease intervals, automatic lubrication system upkeep and basic oil analysis. That's nine tasks in all. MLT is described in similar hands-on terms, for technicians who regularly work on machines and directly affect the condition of lubricants and hydraulic fluids.
| MLT I | MLA I | |
|---|---|---|
| Main focus | Applying lubricant correctly: routes, regreasing, contamination control | Lubricant condition: sampling, basic oil analysis, plus lube practices |
| Typical job titles | Lubrication tech, PM tech, millwright, mechanic | Lubrication tech, PM tech, millwright, mechanic |
| Exam | 100 multiple-choice questions, 3 hours, closed book | 100 multiple-choice questions, 3 hours, 70% to pass |
| Testing options | Online proctored or in-person | Online proctored or in-person |
| Best fit | You run the lube routes and own the grease guns | Your plant samples oil and someone needs to act on the reports |
Exam details come from ICML's MLA I page and the MLT I listing on My Next Move, a Department of Labor career site. The MLA I page we opened listed the 70% passing score, but the MLT I listing didn't give one. Confirm it on ICML's own MLT page.
What the Lubrication Certification Exams Cover
ICML publishes a Body of Knowledge and Domain of Knowledge for each exam. Download the one for your exam before you study. Based on the MLA I task list above, expect questions on:
- Storage and handling. Keeping new oil clean and dry, labeling it, and avoiding cross-contamination between products
- Selection. Matching viscosity and additive type to the machine and its operating conditions
- Grease practice. How much, how often, and how to avoid overgreasing bearings and blowing out seals
- Oil changes and top-offs. Doing them without bringing in dirt
- Automatic lubricators. Keeping single-point and centralized systems working
- Sampling and analysis basics. Where to pull a sample and what common test results suggest
Watch the closed-book format. The MLT I exam is closed book. You can't look up viscosity grades or regrease formulas during the test, so learn them well enough to recall under time pressure. A hundred questions in three hours works out to under two minutes each.
What a certified lube tech does differently on a route
The exam topics turn into habits you can see on the floor. A tech who has studied for MLT or MLA tends to:
- Wipe grease fittings clean before attaching the gun, instead of pushing dirt into the bearing
- Use labeled, dedicated containers and grease guns for each product, so a gear oil never ends up in a hydraulic reservoir
- Question a regrease interval that was set years ago and never checked
- Treat an oil sample as a measurement, pulling it from the same point the same way every time so the trend means something
- Write down what they saw on the route, such as a weeping seal, a hot bearing housing or an empty auto-lubricator, rather than only marking the PM done
That last habit links lube work to the rest of maintenance. Route notes become work orders, and work orders become the history reliability engineers use to decide what to fix for good.
Eligibility and Keeping the Credential
ICML puts eligibility rules under a Requirements tab for each exam, and they can include training and experience. My Next Move's MLT I listing marks both education or training and work experience as required. Read ICML's current Requirements tab before you register so you don't pay for an exam you can't sit yet.
Renewal is easy to overlook until it's late. My Next Move lists a three-year renewal cycle for MLT I, with at least two options: continuing education units, re-examination, or continuing professional development. For MLA I, ICML says points can come from:
- Attending conferences
- Employment in the field
- Publishing or presenting
- Training
Points must be earned while the certification is still active, and approved points can count toward more than one ICML credential. If employment is your only source of points, ICML lets you add up to three more from best-practice work, such as auditing a lube program or writing lubricant specifications. That rewards techs who improve their plant's program, not only those who travel to conferences.
Is Lubrication Technician Certification Worth It?
For context, the median wage for industrial machinery mechanics was $31.02 an hour, or $64,520 a year, according to 2025 BLS data on O*NET. We found no reliable figure for how much an ICML credential adds to pay, so treat any precise number you see with suspicion. The value shows up in other ways:
- The work becomes yours. A certified lube tech usually controls the routes, the lube room and the product list, instead of being the newest person doing the dirty jobs.
- It shows up in failure reviews. When a bearing fails, the root cause is often contamination or bad greasing. Being the person who can explain that, and prevent it, earns respect quickly.
- It moves you toward reliability work. Lubrication sits next to vibration and oil analysis in condition monitoring. MLA plus a vibration category makes a strong reliability tech profile.
It matters less if your plant has no lube program and no interest in starting one. In that case, the credential is mostly a resume item for your next job, and that can still be worth it if you're aiming for plants with mature reliability programs.
Which Should You Take First?
| If this describes you... | Start with |
|---|---|
| You run PM or lube routes and handle grease guns, oil carts and filter carts every day | MLT I |
| Your plant sends oil samples to a lab and nobody really reads the reports | MLA I |
| You want to move into a reliability tech or condition monitoring role | MLA I, then add vibration Category I |
| You're a millwright who handles gearboxes and hydraulics but not daily routes | MLA I for the broader analysis view, or MLT I if the plant is building a lube program around you |
| You're brand new and still learning the plant | Neither yet. Get the safety basics and learn the equipment first. |
If you're in that last group, start with the core safety certifications plants expect, including lockout/tagout, before you add a reliability credential.
A Simple Preparation Plan
- Download the ICML Body of Knowledge for your exam and mark the topics you haven't done on the job.
- Walk your own lube room and routes with the task list in hand. Note every gap, such as unlabeled containers, open breathers or guessed regrease intervals.
- Fix one or two of those gaps with your supervisor's OK. That's study and best-practice evidence in one.
- Take a prep course only if it follows ICML's published body of knowledge.
- Schedule the exam online once your practice scores are comfortably above passing.
- Set a calendar reminder well before your three-year renewal date and keep a points file as you go.
Lubrication technician certification is one of the most practical reliability credentials a maintenance tech can earn, because it ties straight to the failures your crew already deals with. Take MLT I if you run the lube routes. Take MLA I if you want to understand oil analysis and head toward reliability work. Either way, read ICML's current requirements and fees first, and track renewal points from day one.