The Mercedes-Benz G-Class W465, like most vehicles, uses power steering fluid to ensure smooth and precise steering, particularly when driving off-road or at low speeds. Power steering fluid serves as a hydraulic fluid that assists the steering mechanism, making it easier for the driver to turn the wheel by reducing the effort needed.

Key Points About Power Steering Fluid for the G-Class W465:

1. Type of Power Steering Fluid:
   • The Mercedes-Benz G-Class W465 typically uses hydraulic fluid, which is essential for the operation of the steering system, particularly in vehicles with power-assisted steering.
   • For the W465, the recommended type of fluid may vary based on the model year and specific steering system. ATF (Automatic Transmission Fluid) or specialized hydraulic fluid could be used, depending on the system installed.
2. Recommended Fluid Brands:
   • Mercedes-Benz usually recommends using its OEM (Original Equipment Manufacturer) fluids, which are specifically designed for the vehicle's systems, including the power steering.
   • Popular fluids for the G-Class W465 include:
     • Mercedes-Benz Power Steering Fluid (OEM product).
     • Pentosin CHF 11S – A common fluid that meets the requirements for many Mercedes-Benz models.
     • Mobil 1 Synthetic ATF – Often used for power steering systems that call for ATF-based fluids.
3. Power Steering Fluid Capacity:
   • The capacity of the power steering system may vary depending on the model and whether there are modifications or different steering components installed. Generally, the power steering fluid reservoir in the G-Class W465 holds 0.8 to 1 liter of fluid.
   • Check the owner’s manual or service manual for your specific model to ensure accurate fluid capacity.
4. Signs You Need to Change Power Steering Fluid:
   • Hard steering: If the steering feels stiff, it could be a sign of low or contaminated power steering fluid.
   • Noisy steering: A whining or squealing noise when turning the wheel is often an indication that the power steering fluid level is low or that the fluid is old.
   • Leaking fluid: If you notice fluid under your vehicle, it could indicate a power steering fluid leak. It's important to address this issue immediately to avoid damage to the power steering pump and other components.
5. Power Steering Fluid Change:
   • Regular maintenance includes checking and changing the power steering fluid to maintain the proper operation of the steering system.
   • Depending on the fluid type used and driving conditions, it's recommended to change the fluid every 30,000 to 60,000 miles (48,000 to 96,000 km) or as specified by the manufacturer.

How to Check and Top-Up Power Steering Fluid in the G-Class W465:

1. Locate the Power Steering Fluid Reservoir:
   • In the G-Class W465, the power steering fluid reservoir is typically located near the front of the engine bay. It may have a yellow cap or a label indicating power steering fluid.
2. Check Fluid Level:
   • With the engine turned off, remove the cap and wipe the dipstick clean. Reinsert the dipstick and remove it again to check the fluid level.
   • The level should be between the minimum and maximum marks on the dipstick. If the fluid level is low, top it up with the recommended power steering fluid.
3. Top-Up Fluid:
   • Add the correct power steering fluid slowly, checking the fluid level after each addition. Be careful not to overfill, as this can lead to leaks or damage to the system.
4. Check for Leaks:
   • If the fluid level is low and you frequently need to top it up, check for visible leaks around the power steering pump, hoses, and fluid reservoir. Leaks should be addressed immediately to prevent damage to the steering system.

Common Power Steering Fluid Brands and Their Compatibility:

1. Pentosin CHF 11S:
   • This is a commonly recommended fluid by Mercedes-Benz for power steering systems and is often compatible with the G-Class W465.
   • It is a synthetic-based hydraulic fluid that is designed to handle the high pressures found in modern power steering systems.
2. Mobil 1 Synthetic ATF:
   • Used for power steering systems that require an ATF-based fluid.
   • Mobil 1 ATF is a high-performance synthetic fluid that meets many automotive power steering fluid specifications.
3. Mercedes-Benz Power Steering Fluid (OEM):
   • OEM fluid is formulated to match the specific needs of Mercedes-Benz vehicles. It’s always best to use the manufacturer-recommended fluid if available.
4. Prestone Power Steering Fluid:
   • While Prestone offers a wide range of power steering fluids, ensure that the one you choose is compatible with the G-Class W465’s system. Always check the label for compatibility.

Conclusion:

Using the correct power steering fluid for your Mercedes-Benz G-Class W465 is critical for maintaining the performance and longevity of your steering system. Always refer to the owner’s manual for the precise fluid type and quantity, and ensure that you're using the appropriate brand and type of fluid for your vehicle’s specifications. Regularly check fluid levels and look out for signs of low fluid or leaks to prevent any steering issues while off-roading.