Shell ATF 134 FE Mercedes 236.15 Transmission Fluid 1L

If your Mercedes-Benz has the later seven-speed 722.9 automatic, often called 7G-Tronic Plus or NAG2FE+, the fluid it was filled with at the factory is blue and carries MB approval 236.15. Shell ATF 134 FE is one of the fluids built to that approval. Owners land here when they are topping up after a leak repair, doing a pan and filter service, or trying to work out why a shop said the car needs a specific blue fluid instead of the red Mercedes ATF they already have on the shelf. This listing is one 1-liter bottle.

What this fluid does in a 722.9

The 722.9 changes gears by releasing one clutch or brake while applying another, and the electro-hydraulic control unit under the case times that overlap from what it has learned about how the friction elements grab. The fluid is part of that equation. Its friction characteristics decide how smoothly a clutch picks up load and how the converter lockup clutch behaves at light throttle, and it also carries away heat and keeps the small valve body passages clean. Mercedes redesigned the 722.9 for lower fuel consumption, and the later units were matched to a fluid with lower friction losses: the 236.15 specification. Shell describes ATF 134 FE as developed for this latest NAG2FE+ generation of the Mercedes seven-speed, for first fill and for service.

That is also why the fluid is not interchangeable with older Mercedes ATF. Shell states that ATF 134 FE must not be used in older Mercedes five- and seven-speed automatics that call for 236.10, 236.12 or 236.14 fluid, and Mercedes has warned in a service bulletin against mixing 236.14, 236.15 and 236.16 oils in the same unit.

Symptoms that point to a fluid problem

• Shudder or a vibration at light, steady throttle while the converter clutch applies
• Harsh or bumpy upshifts, especially 1-2 and 2-3, or flare between gears
• Delayed engagement into Drive or Reverse after the car has been sitting
• Dark or burnt-smelling fluid when the drain plug comes out
• Shift complaints that started after a fluid service, which can mean the wrong specification went in

How to confirm what your 722.9 needs

Do not go by model year alone. Mercedes changed 722.9 fluid around June 2010: units built before then use red 236.14, later units use blue 236.15 or, on some applications, 236.16, and a replacement transmission may not match what the car originally shipped with. Check the transmission ID tag and production number, look at the color of the fluid that drains out, or read the specification in Mercedes diagnostic software. Our 722.9 fluid change cost guide walks through the service and what it should cost, and the 722.9 leak guide covers the connector and pan leaks that usually explain a low level. If a code for a solenoid, speed sensor or the control unit is stored, fix that first; new fluid will not cure an electrical fault.

Fitment

This fluid is for Mercedes-Benz 722.9 seven-speed automatics that specify MB 236.15, the later NAG2FE+ units found across C-, E-, S-Class, GL, ML and other models. It is not for the 722.6 five-speed or for early red-fluid 722.9 units. If you are not sure which specification your transmission takes, send us the year and VIN before ordering. You can find filters, service kits and hard parts for these transmissions on our 722.6/722.9 collection page.

Install notes

• Order enough bottles for the job. A pan and filter service on a 722.9 takes several liters, and a more complete exchange takes more.
• Fill through the drain port with an adapter and a pump; the 722.9 has no dipstick tube to pour into. Our 722.9 fluid fill adapter kit covers the hardware.
• Set the level with the engine running and the fluid at the temperature the factory procedure calls for. The overflow pipe in the pan sets the final level, so let the excess drain until it drips.
• Replace the filter, pan gasket, single-use pan bolts and the drain plug seal while the pan is off. The 722.9 blue 236.15 service kit packages those parts with fluid if you would rather buy it all at once.
• Do not add aftermarket additives, and do not top up a 236.15 unit with 236.14 or a multi-vehicle ATF.

Can I use this in a 722.6 five-speed?

No. The 722.6 uses red 236.14-approved fluid (or earlier specs it superseded). Shell states that ATF 134 FE must not be used in older Mercedes five- and seven-speed automatics that require 236.10, 236.12 or 236.14 fluid.

How do I know if my 722.9 takes 236.15 or 236.14?

Mercedes switched around June 2010. Check the transmission production number on the ID tag, look at the color of the drained fluid (blue versus red) or read the spec in Mercedes diagnostic software. A replacement transmission may differ from the original, so check the unit itself.

How many bottles do I need?

This listing is one liter. A pan and filter service drains several liters, so buy enough to refill what comes out plus a little extra for setting the level at the overflow pipe.

Can I mix it with the fluid that is already in the transmission?

Only with other 236.15-approved fluid. Mercedes warns against mixing 236.14, 236.15 and 236.16 oils, so if you are unsure what is in there, do a full drain rather than a top-up.

Do I need to reset adaptations after a fluid change?

Many technicians reset or relearn 722.9 adaptations after a service so the control unit relearns clutch fill with the new fluid. If shifts feel off afterward, a scan tool that supports 722.9 adaptation can reset the values.

• 722.9 Fluid Change Cost
• 722.9 Fluid Leak: Common Spots and Fixes for the Mercedes 7G-Tronic
• 722.6 Fluid Type and Capacity: MB 236.14 Spec, Fill Amounts and the Factory Level Check