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What Types of Seals Are In My Car?

Posted on 2018/09/03 | Cliff | Seals

Whether it be a plane, train, or ship, any moving product is filled with hundreds of seals

This also includes your vehicle. Seals help keep everything in your car in working order—from the mechanisms under your hood to your wheels, trunk and even your doors.

Seals keep oil, coolant, and gas in your car so you can make it safely from point A to point B. And seals around your doors and windows keep the weather out, so you can stay warm and dry no matter the weather.

Here’s a breakdown of all the areas in your car that rely on seals for proper functioning.


In modern vehicles, seals can be found in simple devices like the ECU’s that sit on the fender and provide information to the cars fuel and ignition system.


All the motors in your car use seals. This includes the vacuum motors that open and close vents, and your windshield wiper motors.

The motors that roll your windows up and down also have seals installed to keep dirt and moisture out, and grease or oil in.

Doors and Hood

The door frame on each of your car doors, have a variation of seals to keep the elements out and help to keep the car dry and warm.

There are also seals in the lift cylinders for the hood and rear hatch or trunk to allow ease of opening and closing.

Drive Train

Your car’s drive train relies on seals in the water pump shaft seal, the head gasket, the gaskets that keep fluids in the oil pan gasket, and the final drive shaft crank seal.

All these seals see a variety of temperature changes, from extreme cold to above 300+ Fahrenheit.

We even have seals in the joints of our exhaust system, which seal up as the temperature rises.


The transmission has a myriad of seals that hold oil in, allow the system to build pressure, which helps shift the transmission through the gears.


The half shafts that drive the front wheels, or the drive shaft that drives the differential that drives the rear wheels, all have rotary and static seals that keep the oil in the road debris out.

Even your spin-on oil filter has a rubber seal required to keep high pressure oil in.


Todays modern braking systems have seals in the anti-lock valves to prevent skidding, there are also seals in the brake valve that transfers the pedal motion to bring the vehicle to a complete stop.

The brake caliper also has seals to maintain the oil within the brake along with grease seals that keep road dirt out of the system.


Our power steering systems have a pump and cylinders all having seals to maintain pressure while making our steering sensitive to varying speeds.

Even all electric vehicles have some form of power assist which utilizes fluid that helps to improve steerability of your vehicle.


Whether your car’s suspension system is active or passive, seals help keep oil in both dynamic and static seals.


The batteries have seals to maintain a constant environment keeping their temperature controlled to insure long recharging life.

Electric Cars

Electric cars use seals to protect the motor from dirt. Rotary seals keep grease in the bearings, while keeping dirt out.

As our vehicles become more animated with less driver intervention, there are a variety of devices that will steer the vehicle along with accelerate and slow the vehicle

So regardless of the type of car you have or the propulsion device that drives the vehicle, seals will remain an integral part of keeping your vehicle running for many years to come.

From your car to your kitchen to medical equipment, seals are the glue that keep everyday mechanisms in working order. Discover more seals we use everyday >