What type of transmission fluid does the Mercedes-Benz GLC300/GLB use? How to determine it based on the vehicle model, transmission code, and OEM standard.

Do the Mercedes-Benz GLC300 and GLB use the same transmission fluid?

Are not.

Although both belong to Mercedes-Benz, the GLC300 and GLB are developed on two different powertrain platforms.

The GLC300 in Vietnam uses a 9-speed automatic transmission.9G-TRONICMeanwhile, the GLB can use either a 7-speed or 8-speed dual-clutch transmission depending on the version. Mercedes-Benz Vietnam confirms that the GLC300 4MATIC uses the 9G-TRONIC, while the GLB 200 AMG popular in Vietnam uses the 7G-DCT and the Mercedes-AMG GLB 35 uses the AMG SPEEDSHIFT DCT 8G 8-speed dual-clutch transmission. Mercedes-Benz

Therefore, choosing oil based solely on the Mercedes-Benz brand name is not advisable.

The correct procedure should be:

Vehicle Make → Model Year → Version → Transmission Type/Code → OEM Standard → Compatible Products

Quick comparison table of Mercedes-Benz GLC300 and GLB

Car line	Common gearboxes	Gearbox code/group	The oil standard needs to be checked.
Mercedes-Benz GLC300	9G-TRONIC 9 levels	725.0	MB 236.17
Mercedes-Benz GLB 200 AMG	7G-DCT	DCT 7 levels	Look up the exact part number using VIN/transmission code.
Mercedes-AMG GLB 35	AMG SPEEDSHIFT DCT 8G	724.1 / 8G-DCT	MB 236.22

This table is for initial guidance only. When changing the oil, the garage should still compare the VIN and the vehicle's technical data.

What type of transmission fluid does the Mercedes-Benz GLC300 use?

The GLC300 uses a 9G-TRONIC transmission.

The GLC300 generations distributed in Vietnam use a 9-speed 9G-TRONIC automatic transmission. Mercedes-Benz Vietnam announced this configuration on the GLC300 4MATIC. Mercedes-Benz

9G-TRONIC is a traditional automatic transmission that uses:

Torque converter

Multi-disc clutches

Planetary gear system

Hydraulic system

Mechatronic and solenoid valves

In this system, the transmission fluid not only serves a lubricating function but also directly participates in the process of pressure transmission and friction control.

For the 9G-TRONIC transmission in the 725.0 series, the standard oil checks typically required are:

Mercedes-Benz MB 236.17

Mercedes-Benz currently offers genuine oil products conforming to standard 236.17, while GARTZ 9G-HP also claims compliance.Mercedes MB 236.17 / 9G-Tronic / 725.0. Mercedes-Benz USA LLC

You can refer to this. GARTZ 9G-HP – 9-speed transmission fluid.

Why shouldn't the GLC300 9G-TRONIC use conventional ATF?

The 9G-TRONIC transmission has very precise requirements regarding:

Viscosity

Friction stability

Heat resistance

Hydraulic pressure control capability

Compatible with clutch and valve body

GARTZ also noted that 9G-TRONIC requires the correct oil specifications, as incorrect viscosity or friction characteristics can cause jerky gear changes, lag, or increased operating temperatures. GARTZ

Therefore, simply seeing a bottle of oil labeled "ATF 9-speed" is not enough to draw a proper conclusion.

It is necessary to check if the product meets the requirements.MB 236.17or not.

What type of transmission fluid does the Mercedes-Benz GLB use?

The answer is more complicated than with the GLC300 because the GLB has multiple transmission options.

The Mercedes-Benz GLB 200 AMG uses a 7G-DCT.

The GLB 200 AMG, popular in Vietnam, uses a 1.3L M282 engine paired with a dual-clutch automatic transmission.7G-DCT. Haxaco Mercedes-Benz

This is not an automatic transmission that uses a torque converter like the GLC300.

DCT uses two clutches to control even and odd gears, allowing for faster gear changes and reduced transmission losses.

Due to their different structures, DCT transmission fluids must meet specific characteristics regarding:

Clutch friction

Heat resistance

Gear lubrication

Hydraulic control

Compatible with mechatronics

The 9G-TRONIC oil from the GLC300 should not be used as a direct replacement for the GLB 7G-DCT oil.

With the GLB 200 AMG, the garage needs to accurately identify the transmission code and the Mercedes-Benz specifications listed for that particular vehicle before selecting the oil.

The Mercedes-AMG GLB 35 uses an 8G-DCT.

The Mercedes-AMG GLB 35 4MATIC uses a transmission.AMG SPEEDSHIFT DCT 8GMercedes-Benz also announced an 8-speed automatic transmission configuration for this version. Mercedes Car

This system belongs to the 8G-DCT group and is used on many GLB/GLA vehicles with the following transmission code:

724.1

Mercedes-Benz specifies the oil for the 8F-DCT according to the following standard:

MB 236.22. Mercedes-Benz fluids

The technical documentation for the GLB with the 724.1 transmission also confirms the use of specification oil.236.22. LEMON Manuals

Are MB 236.17 and MB 236.22 the same?

Are not.

These are two standards for two different types of transmissions.

Standard	Typical applications
MB 236.17	9G-TRONIC 725.0
MB 236.22	8G-DCT / 724.1

MB 236.17 is used for the 9G-TRONIC automatic transmission, while MB 236.22 is announced by Mercedes-Benz for the 8F-DCT transmission. Mercedes-Benz USA LLC

Therefore, one should not infer:

"Since they're all new Mercedes models, the oil can be used interchangeably."

The two gearboxes differ completely in their power transmission principles and friction requirements.

Is the Gartz 9G-HP suitable for the Mercedes GLC300?

According to GARTZ's product page, the 9G-HP is advertised to meet the following requirements:

Mercedes MB 236.17 – 9G-Tronic – 725.0

Additionally, the product claims compatibility with certain 7G-Tronic and ZF 8HP/9HP gearboxes. GARTZ

Therefore, with the GLC300 identified as using 9G-TRONIC 725.0 and requiring MB 236.17, the GARTZ 9G-HP is a viable option for comparison.

It is important to confirm this:

Car model

Gearbox code

COME

OEM Standard

before proceeding with the oil change.

Is the Gartz DCTF suitable for the Mercedes GLB?

GARZ DCTFGARTZ has designed many dual-clutch transmissions, including the Mercedes DCT. GARTZ

However, one should not conclude that a product is suitable simply because the vehicle uses DCT.

For example, with the GLB using the 8G-DCT 724.1, Mercedes-Benz requiresMB 236.22. Mercedes-Benz fluids

If the GARTZ product specifications page or technical documentation does not directly specify the MB 236.22 standard for the specific product, the garage should confirm with the technical department before use.

The principle remains the same:

DCT is just a type of transmission. The OEM standard is the deciding factor.

Why can't the Mercedes GLB select oil based solely on the number of gears?

A GLB can appear with:

7G-DCT

8G-DCT

But "7 gears" or "8 gears" only describe the number of gear ratios.

That doesn't tell the whole story:

Clutch structure

Hydraulic system

Gearbox code

Type of oil

Friction properties

OEM Standard

Therefore, the sentence:

"This is a Mercedes with an 8-speed transmission, so just use 8-speed oil."

That is not yet technically feasible.

How to accurately determine the transmission fluid level in a Mercedes-Benz GLC300/GLB.

Step 1: Accurately identify the model.

First, it's necessary to distinguish between them:

GLC300

GLB 200

GLB 35 AMG

Other imported versions

Step 2: Check the vehicle model.

The model year helps to pinpoint the transmission generation.

However, the year of registration should not be used as the sole piece of data.

Step 3: Inspect the engine and drivetrain.

For example:

The GLC300 4MATIC and GLB 200 AMG differ significantly in their powertrain platforms.

Step 4: Determine the type of gearbox

Possible encounters:

9G-TRONIC

7G-DCT

8G-DCT

Step 5: Identify the gearbox code.

For example:

725.0 → 9G-TRONIC

724.1 → 8G-DCT

The gearbox code is much more accurate than the trade name.

Step 6: Check for OEM standards.

For example:

725.0 → MB 236.17

724.1 → MB 236.22. GARTZ

Step 7: Compare with the product.

Only after determining the OEM standard should you choose a GARTZ product or another oil with suitable specifications.

Why is the transmission code more important than the car's name?

The vehicle's name only helps in narrowing down the search area.

The new transmission code helps garages identify it accurately:

Gearbox type

Standard oil

Oil change procedure

Filter location

How to check the oil level

Test temperature

Reference capacity

This is especially important for Mercedes-Benz because a model may have different transmissions depending on the version or market.

GLB is a very clear example:

GLB 200 AMG → 7G-DCT

while:

AMG GLB 35 → 8G-DCT. Haxaco Mercedes-Benz

Is it okay to use GLC300 ATF oil for GLB?

Do not use without authorization.

The GLC300 9G-TRONIC has a traditional automatic transmission with a torque converter.

The GLB uses a DCT that is based on a dual-clutch system.

Although both are "automatic transmissions," their power transmission mechanisms differ significantly.

DCT requires very precise clutch friction control, while ATF 9G-TRONIC is designed for torque converter systems and clutches in planetary transmissions.

Therefore, the correct Mercedes-Benz brand does not necessarily mean the correct oil.

Signs that your Mercedes GLC300/GLB needs a transmission fluid check.

Some signs that should be checked early include:

The car jerks when shifting gears.

Enter D or R for slow response.

Shifting gears is no longer smooth.

Vibration when running at low speed

The gearbox changes feel when hot.

There is a transmission malfunction warning.

The oil smells burnt or shows signs of leakage.

With GLB DCT, vibration or jerking at low speeds could also be related to clutch adaptation, control software, or mechatronics, and not necessarily just the oil.

Therefore, a thorough diagnosis is necessary before deciding to change the oil.

Should Mercedes transmission fluid be changed using a circulating system?

A single procedure should not be applied to all Mercedes-Benz vehicles.

With 9G-TRONIC and DCT, checking the oil level typically depends on:

Oil temperature

Charging/discharging process

Diagnostic equipment

Engine status

Gearbox code

Specifically for 8G-DCT 724.1, the oil filling and testing procedure must be carried out according to specific temperature and technical specifications. LEMON Manuals

If the vehicle is showing signs of slipping, vibration, or transmission problems, a diagnosis should be made before performing an oil change.