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Slick Autos
Black Mercedes-Benz AMG GT photographed in a low-light urban setting — representative of the AMG platforms we service and tune.
Specialist Service

Mercedes-Benz Specialist

Mercedes-Benz is the car we work on more than any other. Dealer-level XENTRY diagnostics, proper servicing and the complex repairs other garages walk away from.

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Mercedes done properly — by specialists

Mercedes-Benz is the car we work on more than any other. From W204 C-classes to W213 E63 AMG S, from ML to GLE, Slick Autos is set up from the ground up to service, diagnose and repair Mercedes vehicles to the same standard you'd expect from a Mercedes-Benz main dealer — and in many cases better.

We run a genuine Mercedes XENTRY diagnostic system, the same platform main dealers use. That means full access to all control units, guided fault finding, SCN coding, variant coding, component protection resets and dealer-level software updates. It also means your car's digital service record can be maintained here with the same integrity as a Mercedes retailer.

Based just off the M4 in the Slough / Iver SL0 area, we serve drivers across Berkshire, Buckinghamshire and West London — including Langley, Windsor, Staines, Uxbridge and Maidenhead.

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Dealer-level service record

Where it matters for resale and warranty, a digital service record carried out on genuine XENTRY has the same standing as a main-dealer stamp. We carry out servicing to Mercedes-Benz ASSYST PLUS service intervals, log the entry against your VIN, and give you a full printout of work carried out.

This matters most on newer Mercedes vehicles where the service history is held in the car's memory and accessible to future buyers via XENTRY.

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Complex fault finding

If another garage has given up on your Mercedes, come and talk to us. Intermittent airmatic faults, AIRMATIC compressor replacements, mystery warning chimes, transmission faults and AdBlue issues are bread-and-butter work here. We don't guess — we log, we test, and we fix it once.

  • Mercedes-AMG — A45, C63, E63, GLC63, GLE63, G63
  • Mercedes-Benz — C, E, S, GLC, GLE, GLS, V-class
  • Older classics — W204, W212, W221, W166, W463
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AMG servicing and performance work

We also look after the full AMG line — from the M139 (A45 S) through to the M157 and M177 V8s in the C63, E63 and GLE63. Service work on schedule, known-issue repairs, and — when you want it — Stage 1 and Stage 2 maps developed in-house on the rolling road with DSG/MCT transmission calibration.

  • Genuine Mercedes XENTRY / DAS diagnostics
  • Dealer-level digital service record
  • SCN coding and variant coding
  • AMG servicing, repairs and optional remapping
  • Genuine and OEM-grade parts sourced to your VIN
  • Airmatic, 4MATIC and complex fault diagnosis
  • Full pre-purchase Mercedes inspections
Sound familiar?

Symptoms we see

If any of these match your car, this is the service for you. Book a diagnostic and we’ll confirm the fault in writing before touching anything.

  • Engine warning light on a Mercedes-AMG
  • Airmatic or ABC suspension fault
  • Transmission limp mode or erratic shifts
  • Main dealer quoting £XX for a 'mystery fault'
  • Service overdue warning on ASSYST PLUS
  • Coding or variant change needed (lights, mirrors, retrofit)
  • Pre-purchase inspection on an AMG / S-class
Our process

How we run this job.

Every service follows the same disciplined sequence. No steps skipped, no surprises on the final bill.

  1. STEP 0145 min

    XENTRY diagnostic scan

    Full scan of every control unit — engine, transmission, ABS, ESP, airmatic, SAM modules, body, infotainment. We leave nothing unread.

  2. STEP 0215 min

    Written report

    Every stored code, every soft fault, every open recall — listed with severity and a plain-English explanation. You keep a copy.

  3. STEP 03Same day

    Fixed-price quote

    Parts and labour itemised. Genuine vs OEM options where available. No work starts until you've approved the number.

  4. STEP 04Varies

    Repair / service

    Carried out to Mercedes-Benz factory procedures with the correct lubricants, torque sequences and adaptation resets via XENTRY.

  5. STEP 055 min

    Service record entry

    Work logged against your VIN in the ASSYST PLUS digital service memory — same standing as a main-dealer stamp.

Before you book

What to bring

A quick checklist to make your visit run smoothly. Nothing fancy — just the things that save time at drop-off.

  • V5C or proof of ownership
  • Service history booklet (if you have one)
  • Any recent dealer invoices showing previous work
  • Fuel card or payment method for collection
  • Note down any intermittent symptoms and when they occur
  • Remove valuables from the car before drop-off

Frequently asked

Straight answers.

Do you have genuine XENTRY access?

Yes. We run a genuine Mercedes-Benz XENTRY/DAS setup. This gives us full access to every control module in your Mercedes, including guided fault finding, SCN online coding, variant coding and software updates — the same level of access a Mercedes main dealer has.

Can you maintain my Mercedes digital service record?

Yes. Services carried out here are entered into the car's digital service history via XENTRY, against the VIN, exactly the same way a Mercedes main dealer would log it. You receive a printout of the work and the entry is visible in the car's memory.

Will servicing with you affect my Mercedes warranty?

Under the EU Block Exemption rules, you are free to service your car anywhere that uses parts of matching quality and follows the manufacturer's schedule — your warranty remains valid. Slick Autos services Mercedes vehicles to factory ASSYST PLUS intervals using genuine and OEM-grade parts, so the warranty is protected.

Do you work on AMG models?

Yes — AMG makes up a large share of our workload. We service, diagnose, repair and tune AMG vehicles from the entry-level A45 up to the C63, E63, GLE63 and V8 G63. We can also develop custom maps on the rolling road.

Can you diagnose faults other garages couldn't?

Often, yes. Intermittent faults on modern Mercedes vehicles usually need the correct tools and patience. With XENTRY we can see every control module, log live data, and follow Mercedes' own guided fault-finding procedures. Bring the car in for a diagnostic — we'll give you a written report either way.

Do you service older Mercedes models like the W204 and W212?

Yes. We're specialists in the W204 / W212 / W221 era as well as the current generation. These cars are where a good independent really shines — main dealers treat them as legacy, but we still have full XENTRY coverage and the mechanical experience to keep them running properly. Common jobs: balance shaft on the M272, rear airmatic on the W221, valve body repairs on the 722.9 gearbox.

Can you carry out official Mercedes recalls?

Recall work has to go through a Mercedes-Benz main dealer — they're the only entity authorised to close out a recall on the manufacturer's system. If you're not sure whether your car has an open recall we can check it for you at the next service and flag anything outstanding.

What AMG platforms do you tune most?

M139 (A45 S), M177 (C63 S, E63 S, GT), M157 (older E63 / CLS63), M156 (6.2 naturally-aspirated V8) and M278 twin-turbo V8. Each has its own tuning characteristics — the M139 responds exceptionally well to a Stage 1 map, the M177 wakes up properly with Stage 2 and downpipes, and the older M156 benefits from headers and a cam profile rework rather than software alone.

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