Mercedes-Benz 190 SL, W121-190SL (EU)
Differential fluid capacity & service interval
Mercedes-Benz 190 SL, W121-190SL (EU) differential fluid capacity is 2,25 liters. Service intervals include checking at 6000 km and changing at 18000 km. The data covers 1 configuration.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
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Additional Notes
- The Mercedes-Benz 190 SL, W121-190SL rear differential holds 2.25 liters of fluid, a figure consistent with the compact rear axle units found in roadsters of the mid-twentieth century, where the housing volume was sized to lubricate a relatively modest hypoid gear set rather than a larger passenger car or commercial drivetrain.
- The 2.25-liter capacity applies as a service fill quantity, meaning the amount expected when topping up or refilling a differential that remains in the vehicle, as opposed to a full overhaul or bench-rebuild scenario where additional fluid may be required to account for passages and cavities cleared during disassembly.
- Under normal use conditions, the rear differential fluid on the 190 SL, R121 (1955-1963) is subject to an inspection interval of 6,000 km, at which point the level is verified without a mandatory drain and refill.
- The change interval for the same normal use condition is set at 18,000 km, placing a full fluid replacement at every third inspection cycle relative to the 6,000 km check interval.
- A single set of capacity and interval specifications covers the entire 1955-1963 production span of the R121, indicating no differentiation in differential service requirements across the model years represented in the data.