They take CHF11S

Or buy it at the dealership, it's cheaper at the dealer than Pentosin is from some parts stores.

Mine feels stiff at low speeds too and I've changed my fluid.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

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