Mercedes S-Class service, the honest way

Color of Transmission Fluid: What Red, Brown, Black, and Milky Fluid Means

Fresh conventional automatic transmission fluid is commonly translucent red or pinkish-red. Dye makes the fluid easier to identify and can help reveal leaks,…

By Stefan Roth · 2026-08-06

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Mercedes Transmission Fluid: the 722.6 'Lifetime Fill' Myth & the Fix

Why Mercedes called the 722.6 fluid lifetime, what it really needs, and the change procedure that keeps a W220-era transmission alive.

2026-08-06