Brand serviced

Mercedes-Benz workshop and body shop

We work on Mercedes-Benz A, B, C, E and S-Class cars and on the GLA, GLB, GLC and GLE SUVs, as well as the Vito and Sprinter commercial vehicles (up to 3.5 tonnes). Mercedes-Benz manages service intervals through ASSYST PLUS: a network of sensors monitors oil quality, mileage and usage profile, and then determines whether the next service is the lighter Service A or the more comprehensive Service B. Reading ASSYST and resetting it correctly requires XENTRY-compatible diagnostic equipment. Tommy By is an independent multi-brand workshop: under EU Regulation 461/2010 (Block Exemption), your Mercedes manufacturer's warranty stays valid when you service the car here, provided the work follows the ASSYST intervals, with parts of equivalent quality and the booklet stamped.

Mercedes-Benz technical areas we cover

OM diesel engines — OM651 (phasing out) and the current OM654 2.0 common-rail diesel
M petrol engines — M254 four-cylinder 2.0 and M256 inline-six with 48V mild hybrid
9G-Tronic gearbox — nine-speed automatic, with gearbox oil renewal at the prescribed intervals
4MATIC — all-wheel drive with a multi-plate clutch
ASSYST PLUS — sensor-driven Service A / B interval management
MBUX — infotainment with “Hey Mercedes” voice recognition
XENTRY-compatible diagnostics — tooling for engine, transmission, ABS and ADAS ECUs

The Mercedes-Benz jobs customers ask for most

Service A and Service B with ASSYST PLUS reset
9G-Tronic and 4MATIC transfer-case oil renewal
Two-yearly brake fluid replacement (a Service B item)
AdBlue top-up and SCR diagnostics on BlueTEC diesels
MBUX diagnostics and coding after battery replacement
Vito and Sprinter scheduled service and MOT-equivalent inspection up to 3.5 tonnes

FAQ

Frequently asked questions about Mercedes-Benz

Can you read and manage the ASSYST PLUS system for A/B intervals?

Yes. We read the ASSYST status through XENTRY-compatible diagnostic equipment, identify whether the car is due for Service A or B (and which additional items apply — cabin filter, brake fluid, air filter and so on) and run the correct reset after the job. The manual cluster reset does not respect the usage-profile logic and is best avoided.

Are there any known weak points on the OM651 diesel?

The OM651 (a 2.1 diesel widely fitted to the C-Class, E-Class and Vito from 2009 to 2017) is long-lived, but on cars with insufficient injector care we see cracked injectors and timing chain wear around the 200,000 km mark. We check the injectors with a return-flow test and listen to the chain during the scheduled service. On the newer OM654 these issues are far less common.

Do you handle the 4MATIC system on all-wheel-drive Mercedes?

Yes. Modern 4MATIC drivelines (C-Class, E-Class, GLC, GLE) use electronically managed variable torque distribution and a transfer-case oil specification. The transfer case and differential oil renewal is scheduled within the ASSYST PLUS intervals where applicable.

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