Determining the correct power steering fluid for your Mercedes Benz can sometimes feel like navigating a maze. Owners of older models, in particular, often face confusion due to outdated specifications and the evolution of power steering fluids over the years. The original recommendations for classic Mercedes vehicles often point towards ATF Type A Suffix A for power steering systems. However, this specific type of Automatic Transmission Fluid (ATF) is now incredibly difficult to source.
The challenge arises because modern Automatic Transmission Fluids, even those claiming compatibility with older Dexron II or Dexron III standards, are not necessarily identical to the original Type A Suffix A. Furthermore, power steering fluids themselves have diversified significantly. You’ll find conventional (dino) fluids and synthetic options, and mixing these types is generally discouraged. Manufacturers often claim specialized additives in power steering fluids that are designed to reduce wear in the steering box and minimize seal leaks, adding another layer of complexity to the decision.
The shift to rack and pinion steering systems in newer vehicles could also be a factor influencing fluid specifications over time, potentially leading to different requirements compared to the recirculating ball steering boxes found in older Mercedes Benz models.
While online forums and discussions often suggest that Dexron II/III type ATF can function as a power steering fluid in these older Mercedes, concerns remain about potential premature wear or leaks in the steering box. Readily available generic power steering fluids, like Prestone Power Steering Fluid, are a convenient alternative. Prestone and other brands even offer specific power steering fluids formulated for European vehicles like Mercedes and BMW, which are likely synthetic and possibly closer to the original Mercedes-Benz fluid specifications for later models. However, for classic Mercedes, the compatibility with these newer fluids remains a point of ongoing discussion and investigation among enthusiasts and experts alike. The definitive answer regarding the absolute best power steering fluid for these vehicles is still somewhat elusive, highlighting the need for further clarity and potentially more accessible historical fluid specifications from Mercedes-Benz.
