12/11/2025
3min

When the car makes noises: Searching for causes and solutions

#Car

Noise in the car is often a warning signal – it can have harmless causes, but it can also indicate serious problems. Knowing the typical noises and responding correctly saves time, money and stress. Here you will learn how to identify the most common noises, what causes them and how you can eliminate them with the help of our products.

Squealing without bucking when braking

Possible cause:

Worn brake pads
Brake disks undersized or a burr/edge on disk
Small stone between brake pad and disk
Flash rust on the brake disks
Insufficient lubrication of the brake mechanism

Solution:

Have the brake pads and disks checked for damage, wear and safety, and replace them if necessary.
If there is light rust (flash rust), a short drive often helps to free up the brake pads.
For optimum braking performance and protection against corrosion, we recommend our Brake Anti-Squeal Paste. It reduces friction noise, protects the brake mechanism and ensures optimal lubrication of the moving brake components.

Rattling or loud noises in the engine compartment

Possible causes:

Loose parts or brackets
Hydraulic tappets clattering during cold start
Timing chain or chain tensioner rattling or making other noises
Worn-out engine bearings
Deposits in the oil circuit

Solution:

Check that all screws and brackets are tight.
If there are vibrations and unusual jolting, the engine bearings may be worn or deteriorated – replacement is the only solution.
For a clean oil circuit and less noise, we recommend using our Engine Flush before the oil change. It removes deposits in the oil circuit and ensures smoother engine operation.
If the hydraulic tappets clatter during a cold start while the oil pressure is building up, the Hydraulic Lifter Additive can be used to counteract this.
If the timing chain rattles, it should be checked by a specialist workshop and replaced if necessary.
Extra tip: Cera Tec as an oil additive reduces friction and protects against wear – ideal for quieter and smoother engine operation.

Whistling, howling or jolting while driving

Possible causes:

Defective wheel bearing
Imbalance in the tires
Shock absorbers faulty or coil spring broken
Problems in the transmission or differential

Solution:

Check the tires for damage and correct air pressure.
Check whether the shock absorber is leaking oil or is damaged and whether the coil spring is broken.
In the case of periodic rhythmic jolting and loud driving noises, a wheel bearing may be worn and should be replaced as soon as possible.
If the howling and whistling noises persist, the transmission may be affected – this is where the workshop comes in.
For transmissions and differentials, we recommend our Gear-Oil Additive, which reduces wear and minimizes noise.

Cracking and whirring noises when steering

Possible causes:

Steering joints or drive shafts worn
Steering gear defective, power steering leaking, too little oil or worn/aged oil
Lack of lubrication

Solution:

Check the joints and dust boots and have them replaced if necessary.
Have the steering gear and power steering checked.
For optimal lubrication and protection, we recommend our Multipurpose Grease for moving parts.

Summary

Noises in the car are not only annoying, but often an indication that maintenance is required. By regularly maintaining your vehicle and using the right products from LIQUI MOLY, you can prevent many issues, save money on costly repairs, and extend the lifespan of your vehicle.