If WD-40 is the famous blue and yellow can, CRC 5-56 is the one a lot of USA sheds reach for instead.
It is CRC's original multi-purpose spray, the product the company was practically built on, and around here it does the same toolkit-in-a-can job that WD-40 is known for overseas.
It penetrates, it lubricates lightly, it drives out moisture and it shields metal from rust. Like any do-everything fluid though, it is excellent at a handful of jobs and the wrong choice for others. Here is when and why to reach for CRC 5-56 around the home and on small engines, how it stacks up against WD-40, which CRC number does what, and the few spots to keep it away from.
🧪 What CRC 5-56 actually is
CRC 5-56 is a multi-purpose service spray built on a paraffinic oil with a blend of organic corrosion inhibitors. That inhibitor system is the clever part. It forms a continuous protective film that shuts water and oxygen out, which is why CRC pitches 5-56 so hard at rust and corrosion protection. It was CRC's very first product, going right back to the company's beginnings as a direct rival to WD-40, and it is still a shed staple across New Zealand today.
It does four core things:
- Penetrates. Its low viscosity lets it creep into the finest cracks and threads to break the grip of rust and free seized parts.
- Lubricates lightly. It leaves a thin film that restores smooth action and silences squeaks. It is not a grease, so think short-term.
- Displaces moisture. It pushes water off metal and out of electrical and ignition gear, which can get a wet engine running again.
- Protects against corrosion. The inhibitor film holds rust off in humidity, salt air and other harsh conditions, handy if you live near the coast.
One point in 5-56's favour is material compatibility. CRC states it is safe on all metals and alloys and on most painted surfaces, coatings, plastics and rubbers, with the sensible advice to test first if you are unsure. That makes it a bit more forgiving around mixed materials than some petroleum sprays, though I would still keep any oil-based product off rubber that needs to stay flexible long-term.
🏠 The best around-the-home jobs for CRC 5-56
- Freeing seized bolts, nuts and hinges. Its strong penetrating power is one of 5-56's best tricks, often saving you from pulling something apart.
- Driving moisture off wet metal. A spray after rain or a wash displaces water and lays down a rust-resisting film on tools and fittings.
- Protecting against salt air and rust. Coastal gear, the BBQ, trailer fittings and garden tools all benefit from a protective coat.
- Cleaning grime, scale and sticky residue. It lifts dirt, grease, tar and sticker gum off metal and most painted surfaces.
- Quieting squeaks and stiff sliders. Hinges, scissors, window rails and sliding doors all loosen up with a light spray.
The common thread is freeing, cleaning, drying and protecting. Because 5-56 leans so heavily on corrosion protection, it pairs naturally with rust work, and if you are tackling established rust it is worth following a proper process, which I cover in how to stop rust coming back after you remove it.
🔧 CRC 5-56 on small engines and garden gear
On the mower, the trimmer and the chainsaw, 5-56 has a genuine place, as long as you use it for the right things.
- Spark plug service. It eases plug assembly and removal, clears creeping current and protects the plug and boot against moisture.
- Getting a wet engine going. Spraying it over a damp ignition displaces the moisture that stops a mower firing after it has sat out in the wet.
- Protecting starter motors and terminals. A light coat guards against oxidation and moisture on exposed electrical parts.
- Cleaning and storage protection. Wipe a film over bare metal and blades before the gear is stored to keep rust off through the off-season.
What 5-56 will not do is replace a real lubricant. It is not engine oil and it is not bar and chain oil, so never pour it in as a stand-in. It is also worth knowing the difference between a damp engine and a flooded one, because the fix is different, and I walk through the flooded case in my guide to starting a flooded engine.
⚖️ CRC 5-56 vs WD-40: which should you use?
This is the question everyone asks, and the honest answer is that they are far more alike than different. Both are light, multi-purpose sprays that penetrate, displace water, clean and protect, and both leave a thin film that does not last forever. For the vast majority of home jobs, either one will do the work.
| Feature | CRC 5-56 | WD-40 |
|---|---|---|
| Type | Multi-purpose service spray | Multi-use water displacer |
| Penetrating | Strong, a known strength | Good |
| Water displacement | Yes | Yes, its original purpose |
| Corrosion protection | Strong, organic inhibitor film | Good, short-term |
| Plastic and rubber | Safe on most, test if unsure | Use with care on rubber |
| Lasting lubrication | No, thin film only | No, thin film only |
| Specialist range | 6-56, 3-36, 2-26 and more | Specialist line |
The verdict: for general home and garden use it is a coin toss, so buy whichever is cheaper or already on your shelf. CRC 5-56 leans slightly harder into penetration and corrosion protection, which gives it a small edge for rusted, seized and coastal jobs.
🔢 Which CRC is which: 5-56, 6-56, 3-36 and 2-26
CRC's numbered sprays look alike on the shelf but they are tuned for different jobs. Grab the right one and you get a much better result.
- 5-56: the all-round multi-purpose spray for everyday penetrating, freeing, cleaning, light lubrication and rust protection. The one to keep on the bench.
- 6-56: the marine version, with stronger resistance to water and salt spray. The pick for boats, trailers and anything living near the sea.
- 3-36: a longer-lasting corrosion inhibitor that leaves a heavier protective film for storage and long-term rust prevention. Note that 3-36 is not plastic safe.
- 2-26: the electrical specialist, plastic safe and made to protect and improve performance on switches, connectors, relays and circuit boards.
⏳ Why CRC 5-56 doesn't last (and what to use instead)
The biggest mistake is treating 5-56 as a permanent lubricant. It is thin oil, so on anything that moves under load or sits out in the weather the film thins and disappears, and the squeak comes back. Let 5-56 do the freeing, cleaning and drying, then switch to something built to last:
- For metal hinges, gates, tracks and chains, step up to white lithium grease, which sets into a tough, water-resistant film.
- For an exterior gate, I have weighed up the options in my guide to the best oils to lubricate an exterior gate.
- For long-term rust protection on stored gear, reach for CRC 3-36 or a dedicated corrosion inhibitor rather than 5-56.
🚫 Where you should not use CRC 5-56
- Brakes. Brakes work by friction. Any oily film on rotors, drums or pads is a real safety hazard, ride-on mowers included.
- Drive belts. A slick belt slips, loses power and wears out fast.
- Air filters. Do not soak intake foam or paper with it. Clean or replace filters the proper way.
- Soft and porous surfaces. It can leave stains on things like wallpaper and fabric, so keep it to metal and hard surfaces.
- As a substitute for engine or chain oil. It is far too light and short-lived to protect parts running under load.
✅ The bottom line
CRC 5-56 is a brilliant first move and a poor last word. It frees what is seized, dries what is damp, cleans what is grimy and shields metal from rust and salt air, all of it well. Once it has done that, follow up with the right grease, oil or specialist CRC number to make the fix stick. Used that way, 5-56 earns its spot on any New Zealand workbench. Treat it as a forever lubricant and you will be spraying the same hinge for the rest of your life.
❓ Frequently Asked Questions
What is CRC 5-56 used for?
It is a multi-purpose spray for penetrating and freeing seized parts, displacing moisture, cleaning grime and protecting metal against rust and corrosion. It also lays down a light lubricating film that quietens squeaks, though only in the short term.
Is CRC 5-56 a lubricant?
It is a light lubricant, not a grease. It restores smooth action where it penetrates, but the thin film does not last, so for anything under load or outdoors you need a proper grease or oil.
Is CRC 5-56 better than WD-40?
For most home and garden jobs they are interchangeable, so price and availability usually decide it. CRC 5-56 has a slight edge for penetrating rusted, seized parts and for corrosion protection in salt air, while WD-40 has the bigger brand and a wider specialist range.
What is the difference between CRC 5-56 and 3-36?
5-56 is the everyday all-rounder for penetrating, freeing and light lubrication. 3-36 is a corrosion inhibitor that leaves a heavier, longer-lasting protective film, making it the better pick for long-term rust prevention and storage. Note that 3-36 is not plastic safe.
Can you use CRC 5-56 on plastic and rubber?
CRC says 5-56 is safe on most painted surfaces, coatings, plastics and rubbers, and recommends testing first if you are unsure. For rubber that needs to stay flexible over the long term, a silicone product is still the safer choice.
Can you use CRC 5-56 on a small engine?
Yes, for the right jobs. Use it to service a spark plug, dry out a damp ignition to start a wet engine, protect the starter motor and terminals, and shield bare metal before storage. Do not use it in place of engine oil, on the drive belt or on the air filter.
Does CRC 5-56 stop rust?
Yes, its corrosion inhibitors form a protective film that holds rust off, including in humidity and salt air. For long-term protection you need to reapply it regularly or use a heavier-duty inhibitor like CRC 3-36.
