Oil Can vs Grease Gun: Which Lubrication Tool to Specify
Oil can vs grease gun explained: the difference in medium, delivery and sealing, a decision table for bearings, chains, gears and zerk fittings, and which to stock for a maintenance kit.
Oil Can vs Grease Gun
Both put lubricant exactly where a machine needs it, but they are not interchangeable. An oil can delivers thin oil in controlled drops; a grease gun drives NLGI-grade grease under pressure into a bearing or zerk fitting. Picking wrong means either a starved, overheated bearing or a flooded, grit-collecting surface. This guide settles which to specify for each job.
How They Differ
Factor | Oil Can | Grease Gun |
|---|---|---|
Lubricant | Light/medium oil (ISO 32–100 typical) | NLGI 1–2 grease |
Delivery | Drip, stream or fine spray | Packed, high-pressure into a fitting |
Stays put? | No — runs off, needs re-application | Yes — seals out dust and water |
Best for | Tight clearances, fast bearings, chains | Loaded bearings, zerk points, open gears |
Typical size | 100–1000 cc | 400–600 cc cartridge |
Decision Table
- High-speed bearing / spindle: oil can — oil reaches the clearance without churning.
- Sealed bearing with zerk: grease gun — packs the cavity and excludes contamination.
- Roller chain / wire rope: grease gun or heavy oil; grease clings through the links.
- Sewing / textile / clockwork mechanism: oil can with a fine needle spout.
- Open gear / slider: grease gun (or heavy way oil for very slow motion).
- Electrical contact / relay: a drop of light oil only — never grease.
Why Specifiers Carry Both
A maintenance kit that holds only one starves half the machine. Oil reaches surfaces grease cannot penetrate; grease stays where oil would run away. Our machinery lubrication tools overview maps each tool to the asset it serves, and our pump oil can buying guide covers one-hand, metered oil delivery for the line.
Frequently Asked Questions
Is an oil can enough for a zerk fitting?
No. A zerk (grease nipple) needs the pressure of a grease gun to seat grease into the bearing cavity. An oil can will not force lubricant past the check ball.
Can I over-lubricate with an oil can?
Yes, easily — flooded oil attracts grit and can wick into brakes or electrics. Apply one drop at a time and wipe the excess. Our precision oiling guide gives the step-by-step.
Which holds more — oil can or grease gun?
Grease guns run ~400–600 cc cartridges; oil cans span 100–1000 cc. Capacity alone should not decide — match the lubricant to the point.
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