How to reduce the number of lubricants in your plant
Short answer: Most plants can cut the number of lubricants on the shelf by merging products that share the same base oil type, viscosity grade and performance spec. Start with an inventory of every product and every machine, match each machine to its OEM requirement, and consolidate only where the specs overlap. Never consolidate across food-grade lines, incompatible base oils or greases, or a spec the OEM requires. You end up with fewer mix-ups, simpler ordering and less dead stock.
Walk into the lube room of almost any plant that's been running for 20 years and you'll find the history of every supplier, every machine purchase and every maintenance manager on the shelf. There are three different ISO 68 hydraulic oils, two greases that do the same job, and a drum of something nobody remembers buying. Each extra product is another chance for someone to put the wrong oil in a machine.
Why lubricant sprawl happens
- New machines arrive with a "recommended" brand name in the manual, and somebody buys exactly that.
- Suppliers change, but the old products stay on the shelf.
- Different shifts or departments order their own products.
- Nobody owns the lube list.
What too many products costs you
- Cross-contamination: the wrong oil in the wrong machine is one of the most common lubrication failures, and it gets more likely with every product you add.
- Open containers: more products means more partly used drums and pails collecting dirt and water.
- Expired stock: slow-moving products age on the shelf.
- Purchasing time: more line items, more suppliers, more invoices.
- Training: techs can't memorize 30 products.
Step 1: Inventory everything
Walk the plant and the lube room. For each product, record the name, type, viscosity grade, container size, how much is on hand and roughly how much you use. Then list every machine with its lube points, the product in use, the OEM requirement and the sump or reservoir size. A lubrication survey does exactly this, and it's the foundation for everything else.
Step 2: Group products into families
Sort what you have into families, and look for overlaps inside each one:
| Family | Key specs to match |
|---|---|
| Hydraulic oils | ISO viscosity grade (32/46/68), anti-wear type (zinc vs zinc-free), viscosity index, OEM approvals (e.g. Denison HF-0, Eaton, Bosch Rexroth) |
| Gear oils | ISO grade (150/220/320/460), EP level, mineral vs synthetic (PAO or PAG), AGMA or DIN 51517 CLP spec |
| Compressor oils | Compressor type, OEM requirement, synthetic chemistry |
| Way and spindle oils | ISO grade, tackiness, ability to separate from coolant |
| Greases | Thickener type (lithium complex, calcium sulfonate, polyurea), NLGI grade, base oil viscosity, EP and moly additives |
Often you'll find three ISO 46 anti-wear hydraulic oils that all meet the same spec, which is an easy consolidation. Then you'll find one machine that really needs a zinc-free oil, and that product stays.
Step 3: Check compatibility before you merge
Some things should never be consolidated:
- Food-grade (NSF H1) and non-food-grade. Keep these physically separate.
- PAG synthetics and mineral oils. PAG gear and compressor oils are generally not compatible with mineral or PAO oils. A changeover needs a full drain and flush.
- Incompatible grease thickeners. Some combinations, such as certain polyurea and lithium greases, can soften or harden when mixed. Purge thoroughly when you switch.
- OEM warranty requirements. If a machine under warranty specifies a particular approval, the product you consolidate to must carry it.
Step 4: Build the consolidated lube list
The output is one table: every machine, every lube point, one approved product, quantity and interval. Assign each product a short code and a color, for example HYD-46 in blue and GR-EP2 in red.
A simple format looks like this:
| Machine | Point | Product code | Qty | Interval |
|---|---|---|---|---|
| Press 4 | Hydraulic reservoir | HYD-46 (blue) | 120 gal | Oil analysis monthly; change on condition |
| Press 4 | Main drive gearbox | GR-220 (green) | 8 gal | Sample quarterly |
| Conveyor 2 | Bearings (4) | GRS-EP2 (red) | 2 shots each | Weekly |
The example machines and quantities are only to show the format. Your list will come from your survey.
Step 5: Label everything and match the containers
Labels on machines, fill points, storage tanks and transfer containers should all match. Use dedicated, sealed transfer containers for each product, never open buckets or coffee cans. Color-coding is the single most effective way to stop wrong-oil mistakes.
Step 6: Change over carefully
- When the old and new products are compatible, you can usually switch at the next scheduled oil change.
- When they aren't, or when you're unsure, drain and flush, and confirm with oil analysis afterward.
- For grease, purge the old grease out of the bearing until the new grease shows.
- Use up or return the old stock so it doesn't creep back into use.
How many products should a plant have?
There's no magic number. A machine shop might run six or seven products and a large plant with turbines, food lines and specialty gearboxes might need twenty. The goal isn't a number. The goal is that every product on the shelf has a reason to be there.
The purchasing angle
Fewer products usually means fewer suppliers, larger orders of each product and more predictable costs. It also makes bulk delivery practical. Two hydraulic oils in totes or a bulk tank are much easier to manage than eight in drums.