603 MTech Autowerks

603 MTech Autowerks New England’s Trusted Independent Mercedes-Benz Specialists We service most Euro makes including Audi, VW, and BMW.
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- Streamlined Customer Experience
- Competitive Pricing
- Factory Diagnostic Equipment & Tools
- 24,000 Mile / 24 Month Warranty

Specialized in Mercedes-Benz.

05/22/2026

This E63 AMG is already making around 720 wheel horsepower with a Stage 2 tune.

We’re installing over $10,000 in upgrades including VRP exhaust manifolds, an Armaspeed carbon fiber intake, and a VRP billet intake manifold to improve airflow and support more power from the M177 platform.

While we’re in there, we’re also replacing the engine mounts and oil separators as preventative maintenance.

Once everything is installed, the Mercedes will be heading back to the dyno for a custom tune. The owner’s ultimate goal is 800 wheel horsepower with a future high pressure fuel pump upgrade.

Do you think it will have 800 wheel horsepower?

05/16/2026

AMG engines are extremely advanced and require proper diagnostics, factory repair procedures, and technicians that actually understand these platforms. Just because someone can change parts doesn’t mean they understand how these engines are designed to operate.

Who do you trust working on your AMG?

05/15/2026

Customer wanted pops and bangs, now his catalytic converter is melted and clogged.

What started as a burble tune turned into excessive exhaust backpressure, misfires, and a major repair bill. A lot of people love the sound a burble tune gives, but don’t realize the extra heat and stress it can put on the exhaust system over time.

Would you still run a burble tune on your vehicle after seeing this?

05/14/2026

Smoke coming from the exhaust? Most people immediately think blown head gasket, blown engine, or turbo failure.

After inspecting the spark plugs and checking inside the cylinders with a bore scope camera, we found oil leaking past the valves from failed valve guide seals.

Over time, these seals harden and allow oil into the combustion chamber, causing excessive smoke and oil consumption. This is why a proper diagnosis matters before replacing expensive parts.

Would you have guessed valve guide seals?

05/12/2026

Have you ever had a misfire on your Mercedes and had no idea where to start?

A check engine light and a rough idle can be caused by a lot more than just spark plugs. In this video, we walk through the proper way to diagnose a misfire on a Mercedes-Benz instead of just throwing parts at it.

We start by scanning fault codes, checking live data, inspecting ignition components, and verifying what cylinder is actually causing the issue. Proper diagnostics save time, money, and prevent unnecessary repairs.

This is why diagnosing modern Mercedes vehicles requires more than just a code reader.

Would you try diagnosing a misfire yourself?

05/10/2026

The best part of being an owner is seeing your clients grow.

A lot of the people who come through our doors today have been with us since the mobile repair days. Back when I was working out of a small setup, driving to clients, and just trying to build something bigger.

Now years later, it’s crazy seeing those same clients leveling up in life right alongside us. New businesses, business growth, career growth, and even seeing people go from students to professionals in the field they worked so hard to get into. That’s honestly the most rewarding part of all of this.

It’s bigger than just fixing Mercedes. It’s the relationships, the trust, and watching everyone grow together over the years.

We truly appreciate every single person who supports 603 MTech Autowerks. None of this would be possible without you guys.

05/09/2026

Sounds like a loose heat shield, right? Probably a cheap fix right? That’s what most people think until they find out this $70 backing plate turns into a $1,000+ repair on a Mercedes.

On this rear setup, the brake backing plate sits behind the wheel bearing. To replace it properly, the wheel hub has to be pressed out of the bearing, and during disassembly it typically damages the wheel bearing, meaning a new wheel bearing needs to be installed at the same time.

This is why some repairs on Mercedes become so labor intensive even when the actual part is inexpensive.

Would this surprise you if your Mercedes started making this noise?

05/08/2026

Can you believe engine coolant is leaking into the washer fluid tank?!

This 2021 GLC63 came in with a low coolant light on the dash. After pressurizing the system, we found the washer fluid tank leaking coolant.

Some Mercedes use a heated washer system that runs engine coolant through a heating element. When that element fails, it leaks internally and contaminates the entire tank. Sounds crazy, but we’re starting to see this more often.

If you saw a low coolant light, would you ever think to check the washer tank?

05/07/2026

316,000 miles and this 2011 E550 is still going strong. This is why I believe the M273 is one of the most reliable V8 engines Mercedes ever made.

They can have common oil leaks from the oil filter housing, cam plugs, and centrifuge cover but no major engine issues if you stay on top of maintenance.

Oil changes every 3–5k miles, keep up with services, and don’t ignore the belt system. We’ve seen failed pulleys turn into major damage fast.

Would you drive a Mercedes with this mileage?

04/27/2026

This Mercedes was just here for a coolant leak. We found the turbo coolant lines were leaking and a lot of people don’t realize, those lines are actually plastic. Over time with heat and mileage, they get brittle and start to crack. We replaced the lines, pressure tested it, and drove it over 20 miles everything checked out.

Now the radiator is leaking. At 130k miles on the original cooling system, this is exactly what we see the plastic end tanks get weak and start leaking at the seam.

Once you fix one leak, the system holds full pressure again and the next weak point shows up. This is why we sometimes recommend a full cooling system overhaul. More upfront, but it helps avoid this exact situation. Very Unfortunate timing.

Would you fix it all at once, or piece it together??

Address

1298 Smyth Road Unit 24 & 25
Hooksett, NH
03106

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 4pm
Friday 8am - 4pm

Telephone

+16032326500

Website

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