Shell ATF 134 FE Mercedes 236.15 Transmission Fluid 1L

This is the exact fluid a Mercedes-Benz 7-speed 722.9 (7G-Tronic) automatic in its fuel-efficient NAG2FE+ form is supposed to run. Mercedes lists MB-Approval 236.15 for those units, and Shell ATF 134 FE carries that approval, so you are putting in what the transmission was designed around instead of guessing with a multi-vehicle fluid. Use it wrong and a 722.9 will hunt gears, flare on the 2-3, or set an adaptation fault; use the right 236.15 fluid and the shifts stay where the factory calibrated them.

It is a full-synthetic ATF built on hydrocracked base oils with a friction-durable additive package, which matters because the 722.9 leans hard on lock-up and partial-slip converter control. The additive chemistry holds its friction number as the fluid heats and shears, so the converter clutch keeps engaging smoothly over a long drain interval rather than shuddering as the fluid ages. High thermal and oxidation stability keep it from varnishing the valve body and sticking the conductor-plate solenoids, which is one of the common failure paths on these transmissions.

The fluid is dyed blue so you can tell 236.15 apart from the red 236.14/236.12 fluids at a glance during a fill or a leak check. It ships as a single 1-liter bottle; a full 722.9 service typically takes several liters plus a pan and filter, so order enough for the job. Always confirm your model calls for 236.15 specifically, not the older 236.14, before you fill.