Gas Shocks vs. Oil Shocks in Vehicle Suspension System

Suspension technology has evolved significantly over the years, providing vehicle owners with numerous options to improve ride quality, handling, and overall performance. Two of the most popular types of suspension dampers are gas shocks and oil shocks. While they might seem similar, the two have distinct differences that impact their performance, longevity, and suitability for different applications. In this article, we will delve deep into the discussion of gas shocks vs. oil shocks, aiming to provide a clear picture of their advantages and disadvantages.

gas shocks vs hydraulic

What is gas shock absorber?

A gas shock absorber is a key component in a vehicle’s suspension system that helps ensure a smoother ride. It works by absorbing and dissipating kinetic energy produced by the movement of the wheels over uneven surfaces. The gas shock absorber contains a gas, usually nitrogen, and a hydraulic fluid separated by a floating piston within a cylinder.

When the vehicle hits a bump, the piston moves, compressing the gas and fluid, absorbing the shock. This action reduces the impact felt by passengers, enhances road-handling capabilities, and helps maintain tire contact with the road, contributing to overall vehicle safety.

What is oil shock absorber?

Oil shock absorbers, or hydraulic shock absorbers, are vital components in a vehicle’s suspension system designed to provide comfort and stability. They convert kinetic energy from the vehicle’s movements into thermal energy, which is then dissipated through hydraulic fluid. Inside an oil shock absorber, a piston moves up and down through oil-filled chambers, and various valves regulate this oil flow. This process creates resistance to the vehicle’s motion, smoothing the ride over bumps and dips.

Oil shocks are typically cost-effective and provide a comfortable ride. However, bad shock absorbers can be prone to ‘fade,’ a decrease in damping performance when subjected to rough or sustained use, as the oil can foam under these conditions, reducing the shock’s effectiveness. Despite this, oil shock absorbers remain popular for many vehicle types due to their affordability and overall performance.

Gas Shocks vs. Oil Shocks

Here we have shared the differences between gas and hydraulic shock absorbers.

1. Fundamental Principles:

Gas Shocks:

Gas shocks, often called “gas-charged shocks,” incorporate nitrogen gas and hydraulic oil within the shock absorber. The nitrogen gas is pressurized and prevents the oil from foaming or aerating when the shock is working hard. This ensures consistent shock performance even under demanding conditions.

Oil Shocks:

Conversely, Oil shocks rely solely on hydraulic fluid (or oil) to dampen the oscillations. They do not have the gas component. These shocks are more traditional and have been in use for a longer time than their gas-charged counterparts.

2. Performance Characteristics:

Gas Shock Absorbers:

  • Consistency: With the pressurized nitrogen gas, gas shocks offer consistent performance, especially during aggressive driving or off-roading when the shocks are under heavy stress.
  • Reduced Fade: The gas charge minimizes the chances of the hydraulic oil foaming, leading to shock fade—a condition where the shock loses its damping ability during prolonged rough usage.
  • Firmer Ride: Generally, vehicles equipped with gas shocks provide a firmer ride than those with oil shocks. This might benefit sports cars or vehicles that prioritize handling over ride comfort.

Oil Shock Absorbers:

  • Smoother Ride: Oil shocks often provide a smoother and more comfortable ride, making them ideal for daily drivers or vehicles primarily used on well-paved roads.
  • Simplicity: With fewer components (i.e., without the gas charge), less can go wrong with an oil shock. However, this can also be its Achilles heel, as it can lead to performance inconsistencies under heavy stress.

3. Durability and Longevity:

Gas Shock Absorber:

Nitrogen gas prevents the hydraulic oil from overheating, which in turn can extend the lifespan of the shock. Furthermore, since the gas prevents oil foaming, wear and tear on internal components can be reduced.

Oil Shock Absorber:

While oil shocks might have a simpler design, they can be more susceptible to wear over time, especially if frequently subjected to harsh driving conditions. The absence of a gas component means the oil can aerate, leading to reduced performance and increased internal wear.

4. Cost Implications:

Gas Shock:

Typically, gas shocks are more expensive than oil shocks due to their advanced design and the additional materials required. However, their extended lifespan and consistent performance might justify the extra cost for many users.

Oil Shock:

Oil shocks are generally more affordable. Oil shocks might offer better value for money for drivers who primarily stay on well-maintained roads and prioritize comfort over aggressive performance. Thus, replace air shocks with oil one if there is scope.

5. Suitability:

Gas Suspension:

Ideal for:

  • Off-road vehicles that encounter varied terrains and require consistent performance.
  • Sports cars or performance-oriented vehicles where handling and cornering abilities are paramount.

Oil Suspension:

Ideal for:

  • Daily drivers that majorly ply on paved roads.
  • Vehicles where ride comfort is more important than high-performance handling.

Are gas shocks better than hydraulic shocks?

Gas and hydraulic shocks serve similar purposes but have distinct advantages depending on the application. Gas shocks, filled with nitrogen gas and hydraulic oil, reduce oil foaming during heavy use, providing consistent performance and reduced shock fade. This makes them ideal for performance-driven applications and off-roading where consistent damping is critical.

Hydraulic shocks, relying solely on oil for damping, typically offer a smoother and more comfortable ride, suitable for daily driving on regular roads. However, under aggressive or prolonged use, they might suffer from performance fade due to oil leaking. While gas shocks are favored for enhanced handling and consistency in demanding scenarios, hydraulic shocks are often preferred for comfort in everyday driving situations. The “better” depends on the vehicle’s primary use and the desired ride quality.

Do gas shock absorbers have oil in them?

Yes, gas shock absorbers indeed contain oil. The term “gas shock absorbers” primarily refers to using pressurized gas, generally nitrogen, in the device. However, they also contain hydraulic fluid, or oil. A piston moves within a cylinder filled with this oil in the shock absorber. When the vehicle experiences a bump, the piston’s movement forces the oil to pass through small openings, absorbing the kinetic energy and converting it to heat, which is then dissipated. The pressurized gas aids by reducing oil foaming during intense shock absorption, maintaining consistent performance and providing a smooth and stable ride.


Choosing between gas and oil shocks largely depends on individual requirements and priorities. If you seek a firmer, more consistent performance with longevity, especially under demanding conditions, gas shocks are the way to go. However, if your primary concern is a smooth ride, cost-effectiveness, and simplicity, oil shocks might be more up your alley.

It’s essential to assess your driving habits, the terrains you frequent, and your vehicle’s primary use before deciding. Whichever option you lean towards, ensuring regular maintenance and timely replacements will ensure optimal performance and longevity of the shocks.


Mr. Shafiqule Islam is a graduated Mechanical Engineer and has more than 15 years experience of repairing and maintenance of different brand vehicles like Toyota, Mitsubishi, Ford, Mercedes, BMW etc. He is also giving training to Mechanics. He has started writing to share his practical knowledge to Vehicle Owners, Drivers and Mechanics to keep their cars at best fit.

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