Power Steering Additives

Does your car have hydraulic power steering?

Power steering additives only work in hydraulic systems. If your car has electric power steering, there is no fluid in the steering system and an additive is simply not applicable. Older and higher-mileage cars are more likely to have hydraulic steering; many modern city cars and smaller vehicles have switched to electric systems. Check your owner's manual or look under the bonnet for the signs below.

• Hydraulic power steering: You can see a belt-driven pump and a dedicated fluid reservoir in the engine bay. A power steering additive can be applicable, provided the fluid type is compatible with the product label.
• Electric power steering (EPS): No pump, no power steering fluid reservoir. There is no fluid to treat, so a power steering additive is not suitable for your car.
• Electro-hydraulic steering: There is a reservoir and fluid, but the system may use an OEM-specific hydraulic fluid. Check the reservoir cap and your owner's manual. If either states "no additives," do not use one.

If your system uses a specific OEM fluid such as a central hydraulic fluid (CHF type), compatibility is not automatic. Fluid type and additive restrictions are covered further below.

What can a power steering additive fix, and what can it not?

A power steering additive works by conditioning seals, improving lubrication within the pump and rack, and reducing foam and cavitation in the fluid. The result is a more stable fluid that is gentler on aging components. It is a maintenance aid, not a repair product, and the distinction matters.

Works for:

• Light whining or groaning noise, especially at cold start or when turning to full lock, in an otherwise functioning hydraulic system
• Minor seepage from steering rack or pump seals, where fluid loss is slow and there are no puddles forming under the car
• Slightly inconsistent or heavier steering feel in an aging hydraulic system that is still safe to drive
• Preventive conditioning of seals and fluid in a hydraulic system with higher mileage or fluid that has not been changed in several years

Does not work for:

• Sudden, severe, or rapidly worsening steering problems, such as very heavy steering that comes on quickly
• Large leaks or visible puddles of fluid under the car, or a reservoir level that drops noticeably within days
• Metallic grinding, clunking, or strong knocking noises from the steering system
• Worn-out pumps with metal-on-metal contact
• Split hoses, cracked housings, or damaged pipes
• Any situation where steering safety is already compromised

A power steering additive does not replace a worn pump, a damaged rack, or a split hose. If your symptoms fall into the second list, the right step is a garage visit, not a bottle of treatment.

How do you use a power steering additive, and how much?

The process is straightforward, but the order of steps matters.

1. Confirm that your steering system is hydraulic and that the fluid type in your reservoir matches what is listed on the product label.
2. With the engine off and the car on level ground, check that the fluid level in the reservoir sits between the MIN and MAX markings.
3. Pour the additive directly into the reservoir on top of the existing fluid. You do not need to remove fluid first, as long as the total level stays within the MIN-MAX range after adding the product.
4. Replace the reservoir cap, start the engine, and slowly turn the steering wheel from lock to lock a few times so the additive circulates through the system.
5. After a day of normal driving, check the fluid level again and top up with the correct fluid type if needed, without exceeding the MAX mark.

The Lindemann Power Steering Treatment comes in a 300 ml bottle, sized for a standard passenger-car reservoir. Follow the dosage on the packaging. If the fluid in your system is very dirty or has been contaminated with an incorrect fluid, a flush and correct refill is more appropriate than adding any treatment.

Results are not immediate. Improvements in noise, steering feel, or the rate of seepage become noticeable after normal driving, as the additive circulates and the seals respond. If you notice no change after a few weeks, read the section below on when to go to a garage.

When should you go to a garage instead?

A power steering additive is a reasonable response to mild, stable symptoms in a system that is still safe to drive. It is not a substitute for a mechanical repair, and using it to delay a necessary fix is not a responsible approach.

Go to a garage directly if you notice any of the following:

• Steering becomes suddenly very heavy, or you lose power assistance while driving
• A large puddle of power steering fluid appears under the car, or the reservoir level drops quickly
• You hear metallic grinding, clunking, or strong knocking when you steer
• Steering feels jerky, unpredictable, or vibrates strongly, particularly alongside a warning light
• After adding the additive, noise, leaking, or heavy steering does not improve within a few weeks, or symptoms get worse

If symptoms worsen after adding the product, such as more noise, heavier steering, or visible foaming in the reservoir, stop driving and contact a garage. At that point the issue is mechanical and beyond what a fluid treatment can address. Serious mechanical wear ultimately requires component replacement, not further additives.

Which power steering additive fits your situation?

With one product in the range, the choice is straightforward. The Lindemann Power Steering Treatment 300ml is a universal power steering treatment that combines seal conditioning, noise reduction, and wear protection in a single bottle. It covers the two most common situations:

If you already have mild symptoms:

Your steering makes a light whining or groaning noise at cold start or on full lock, you have noticed minor seepage from the rack or pump seals, or steering feels slightly heavier in an aging hydraulic system that is still safe to drive. The Lindemann Power Steering Treatment is designed for exactly this situation. It conditions the seals, supports smoother fluid circulation, and reduces the minor noise and inconsistency that come with an aging hydraulic system.

If you want preventive protection on a high-mileage car:

Your hydraulic steering currently works fine, but the car has high mileage or the fluid has not been changed in several years. The same product can be used once on a healthy hydraulic system to protect seals and slow the onset of typical aging symptoms. It will not make a healthy system feel noticeably different; it is a preventive step, not a performance change.

If you are in doubt between an additive and a repair:

If symptoms are more than mild, such as heavy steering, a large leak, or warning lights, an additive is not the right choice. A garage visit is. An additive is only a reasonable option when your steering is still safe and symptoms are modest and stable.

You can assess whether the treatment has worked by looking for: less whining or groaning over the following weeks, a slower rate of seepage (fewer drops on the driveway, a more stable fluid level), and a more consistent steering feel. If none of those improve, treat the issue as mechanical.

Fluid compatibility: check before you add

Before adding any power steering additive, check your owner's manual and the reservoir cap for the specified fluid type. Many power steering additives are compatible with ATF-based fluids and standard dedicated power steering fluids, but they are not automatically compatible with all OEM-specific hydraulic fluids, including certain CHF types used in some European vehicles. If your manual or reservoir cap states "no additives," do not use a power steering additive. Doing so may affect your warranty coverage on the steering system.

On dosage: using more than the recommended amount can alter fluid properties outside the design range. Follow the label, and do not combine multiple different additives in the same system. If your car has previously been topped up with the wrong or unknown fluid, a flush and correct refill takes priority over any additive treatment.

If you are unsure which fluid your car uses or whether your system is compatible, the safest starting point is your owner's manual. A garage can also confirm the fluid specification and system type before you add anything.