To lubricate a Baldwin lock, use dry graphite powder or a teflon-based dry spray lubricant. Avoid oil-based products like regular WD-40, as they attract dirt and can gum up the precise internal mechanisms.
The best overall lubricant for locks is a professional-grade dry lubricant like a PTFE spray (e.g., Houdini Lock Lube or Tri-Flow). Unlike standard oils or greases, these dry lubrics leave a frictionless coating that won't trap dirt, dust, or metal shavings, keeping your mechanisms smooth and corrosion-free.
If your key is suddenly hard to insert into a lock, the mechanism is likely clogged with debris, the internal pins are sticking, or the metal is misaligned. You can usually fix this quickly by lubricating the lock or checking for obstructions.
You should not use the original WD-40 Multi-Use Formula inside a deadbolt. While it works temporarily to loosen a sticky lock, it leaves behind a sticky film that attracts dirt, dust, and moisture over time, eventually ruining the lock's internal mechanism.
For outdoor locks, PTFE (Teflon-based) dry lubricants or specialized silicone-based sprays are the best options. They repel water, withstand temperature extremes, and leave a dry film that does not attract dirt, dust, or grime.
The short answer: no, you shouldn't use standard WD40 on locks. Many people try using WD40 on locks to loosen them when they get stuck, since it works as a lubricant for many things. But standard WD40 actually does the opposite. WD40 strips a lock of its natural lubricant and can make your lock stiffer or even sticky.
Super Lube Multi-Purpose Synthetic Grease has become their lubricant of choice for high security locksets, combination locks and multipoint locks. They selected Super Lube for its superior lubricating qualities and ability to work in a variety of applications.
No, you should never use olive oil to lubricate a lock. While it may provide a temporary fix, food-based oils go rancid over time. They will dry out, become gummy, and trap dirt and dust, permanently ruining the lock's delicate pin mechanism.
For the best results with locks, avoid the original multipurpose formula, as it can strip existing lubricants and attract sticky dust over time. Instead, use the WD-40 Specialist line, which features three excellent, lock-specific products.
"WD-40 can degrade rubber, such as the rubber seals used around windows and doors. The degradation of these seals can result in air infiltration and thus lower energy efficiency." Using lubricating spray on hinges can increase the risk of attracting dust and dirt, causing them to further stiffen up over time.
A deadbolt that is hard to turn is usually caused by door misalignment (the bolt rubs against the frame) or internal gunk/dryness (the lock needs lubrication).
This means that many modern vehicles cannot be opened with a slim jim at all — and trying to use one can damage wiring, sensors, airbags, or locking systems. So the slim jim tool in 2026 is not a universal solution. It's a vehicle-specific tool.
To fix a stiff lock, apply a dry lubricant like powdered graphite or Tri-Flow into the keyway, then work your key in and out to distribute it. Avoid standard oil-based products like WD-40, which can attract dirt and cause the lock to gum up.
Teflon Dry Lubricant
Teflon-based dry lubricant is preferred by some locksmiths over other options. It's a great option because, as well as lubricating your lock, it repels water and dust. Meaning that once you fix a lock with this type of lubricant, you can expect the lock to be in good shape for a long time.
The best overall lubricant for locks is a professional-grade dry lubricant like a PTFE spray (e.g., Houdini Lock Lube or Tri-Flow). Unlike standard oils or greases, these dry lubrics leave a frictionless coating that won't trap dirt, dust, or metal shavings, keeping your mechanisms smooth and corrosion-free.
To loosen a stiff lock, apply a dry lubricant like powdered graphite or a specialized PTFE spray into the keyhole and work the key in and out to distribute it. Avoid oil-based lubricants like standard WD-40, as they attract dirt and can worsen sticking over time.
Door Locks
"Because WD-40 attracts dust and dirt, it can clog up the internal mechanisms, making the problem worse." Marino recommends using a dry graphite powder instead, which functions as dry lubrication and is a solid choice for stubborn locks.
Polytetrafluoroethylene, or PTFE, is a Teflon-based lubricant that dries inside the lock to leave behind a non-stick, water-repellent film on all the surfaces. Since it's dry, it doesn't attract dust or dirt.
The best lubricant for a sticky lock depends on the lock's location, but Teflon (PTFE) or silicone-based dry lubricants are generally the top choices. For maximum longevity and clean operation, professionals recommend using specialized products rather than standard wet oils.
Don't use oil.
Oil might assist the moving parts of the motor in your car, but it is never a good idea to squirt it in a stiff lock. The oil will just combine with any grime already in the mechanism and compound the situation.
Some of the top door lock lubricant options are:
Fuchs White Grease. Fuchs White Grease is for the long term lubrication of chains, pins, bushes, linkages, cable mechanism, hinges, locks and similar applications. Fuchs white grease spray penetrates and leaves behind an adhesive, waterproof lubricant that prevents seizure and further water ingress.
Yes. When it comes to unsticking rusted or seized bolts and metal parts, true penetrating oils are significantly better than standard WD-40.