The 1989 Mercedes-Benz E350 diesel likely used
ATF (Automatic Transmission Fluid), specifically a type that meets the Mercedes-Benz specification at the time. However,
it's crucial to check your owner's manual. The exact specification will be listed there, and using the incorrect fluid can severely damage your transmission.
Don't rely solely on general advice found online. The manual will provide the definitive answer for your specific vehicle and transmission type. If you don't have the manual, you can try to find a digital copy online or contact a Mercedes-Benz dealership with your vehicle's VIN number for assistance.
