The Mercedes-AMG M133 is the hand-built 2.0-liter turbocharged four-cylinder that powered the first generation of compact AMG 45 models. When it arrived in 2013, it was the most powerful series-production four-cylinder in the world, and it used a closed-deck aluminum block, NANOSLIDE-coated cylinder walls, a forged crankshaft, piezo direct injection and a twin-scroll turbocharger running up to around 1.8 bar of boost. It was built in Affalterbach under AMG's "one man, one engine" philosophy and fitted transversely to the A 45 AMG (W176), the CLA 45 AMG (C117) and the GLA 45 AMG (X156), always with 4MATIC all-wheel drive and a 7-speed dual-clutch transmission.
For enthusiasts, the M133 is the reason these cars are so desirable. It offers huge performance in a compact, practical package, and it is famously receptive to tuning. That combination also means many used examples have been driven hard, modified, or both, so buyers need to separate well-kept cars from worn ones carefully.
Generation matters as well. The M133 was produced in two main outputs: the original 360 hp version and the updated 381 hp version introduced with the model facelifts. The later engine received revised internals and calibration, and the facelift cars also brought transmission and chassis updates that make them the more sought-after choice today.
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Base Specifications
| Spec | Detail |
|---|---|
| Type | Inline four-cylinder, turbocharged gasoline, transverse mounting |
| Displacement | 1,991 cc |
| Block | Closed-deck aluminum with NANOSLIDE cylinder coating |
| Head | Aluminum, 4 valves per cylinder |
| Valvetrain | DOHC, chain-driven, variable intake and exhaust cam timing |
| Injection | Spray-guided direct injection with piezo injectors |
| Aspiration | Twin-scroll turbocharger, up to around 1.8 bar boost |
| Compression Ratio | 8.6:1 |
| Bore x Stroke | 83.0 x 92.0 mm |
| Firing Order | 1-3-4-2 |
| Production Years | 2013–2019 |
First Phase: 360 hp
The launch version of the M133 debuted in the A 45 AMG and quickly spread to the CLA and GLA. In North America, where the A-Class hatchback was not sold, the CLA 45 and GLA 45 were rated at 355 hp.
M133 DE20 AL — 360 hp / 332 lb-ft
| Model | Chassis | Years |
|---|---|---|
| A 45 AMG 4MATIC | W176 | 2013–2015 |
| CLA 45 AMG 4MATIC | C117 / X117 (Shooting Brake) | 2013–2016 |
| GLA 45 AMG 4MATIC | X156 | 2014–2017 |
Second Phase: 381 hp
With the model facelifts, AMG raised output to 381 hp and 350 lb-ft. These later cars also benefited from revised transmission software and other updates, and they are generally the preferred buy. The North American CLA 45 and GLA 45 were rated at 375 hp.
M133 DE20 AL — 381 hp / 350 lb-ft
| Model | Chassis | Years |
|---|---|---|
| A 45 AMG 4MATIC | W176 (facelift) | 2015–2018 |
| CLA 45 AMG 4MATIC | C117 / X117 (facelift) | 2016–2019 |
| GLA 45 AMG 4MATIC | X156 (facelift) | 2017–2019 |
How to Check a Used M133-Powered Car's History
An M133-powered AMG 45 should come with a thorough service record showing oil changes at or below the factory interval, regular spark plug replacements and transmission servicing for the 7-speed dual-clutch gearbox. Ask directly whether the car has been tuned, because many have. Signs include aftermarket intakes, downpipes, intercoolers, non-standard exhaust tips or a dealer record of a software mismatch. A tuned car is not automatically bad, but it should come with documentation of who did the work and what supporting maintenance followed.
Also look for signs of track use or hard launches, such as heavily worn tires, brake upgrades, worn engine mounts or a history of clutch and mechatronic repairs. Performance cars like these are also frequent targets for theft and accident repair, so verify that the mileage, ownership history and any damage records line up.
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Key Strengths
The M133's greatest strength is its exceptional specific output. Producing 360–381 hp from 2.0 liters at the factory, with a warranty and everyday drivability, was a remarkable achievement in 2013, and the engine still feels genuinely quick today. The torque arrives early and the engine pulls eagerly to its redline.
It also has a robust core design. The closed-deck block, forged crankshaft and NANOSLIDE cylinder walls were engineered to cope with high cylinder pressures, which is why the M133 tolerates moderate tuning so well. When maintained properly, the bottom end rarely causes problems at stock power levels.
Finally, the M133 benefits from a large aftermarket and knowledge base. Because it shares its basic architecture with the M270, many service parts are readily available, and AMG-specific components such as intercoolers, intakes, turbo upgrades and engine mounts are widely supported by tuners and specialists.
Known Reliability Issues
7-Speed Dual-Clutch Transmission Wear
Symptom: Jerky low-speed engagement, clunks when shifting between drive and reverse, delayed gear changes, or transmission warning messages.
Cause: The AMG SPEEDSHIFT DCT 7 transmission can suffer from clutch wear, mechatronic unit faults or adaptation issues, particularly on cars used for repeated launches or tuned for more torque.
Severity: Moderate to high. Mechatronic or clutch repairs are expensive.
Typical Mileage: Varies widely; problems can appear from around 37,000 miles (60,000 km), and earlier on hard-driven or tuned cars.
Note: Regular fluid changes and correct clutch adaptations help a lot. Budget roughly $1,700–4,600 for major transmission work depending on what is required.
Engine and Transmission Mount Wear
Symptom: Excessive vibration at idle, clunks on and off the throttle, and a harsh feel during gear changes.
Cause: The high torque of a transverse four-cylinder places considerable load on the mounts, and aggressive driving or launch control use accelerates wear.
Severity: Low to moderate. Worn mounts are rarely dangerous, but they increase stress on other components and degrade refinement.
Typical Mileage: Often from around 37,000–62,000 miles (60,000–100,000 km).
Note: Uprated aftermarket mounts are popular, but they transmit more vibration into the cabin.
Camshaft Adjuster Rattle and Solenoid Leaks
Symptom: A brief rattle on cold start, cam timing fault codes such as P0016, or oil appearing around the camshaft solenoid connectors.
Cause: Like the related M270, the M133 can experience camshaft adjuster wear and solenoid seal failure that lets oil travel into the wiring.
Severity: Moderate. Adjuster issues should be corrected promptly, and oil in the wiring harness must be dealt with before it reaches control units.
Typical Mileage: Typically from around 37,000–75,000 miles (60,000–120,000 km).
Note: Inspect timing chain condition when replacing adjusters. Solenoids are inexpensive to replace preventively.
Turbocharger Wear and Wastegate Rattle
Symptom: Rattling from the turbo at idle or on overrun, boost-related fault codes, smoke or reduced performance.
Cause: The turbo works very hard in this engine. Wastegate linkage wear, heat stress and poor oil maintenance can all shorten turbo life, and tuned cars put even more strain on it.
Severity: Moderate to high. A failed turbo can shed debris into the intake, so problems should be investigated quickly.
Typical Mileage: Often from around 50,000–93,000 miles (80,000–150,000 km), earlier on heavily tuned cars.
Note: Let the engine idle briefly after hard driving and use high-quality oil. Many owners upgrade to a hybrid turbo when replacement becomes necessary.
Spark Plugs, Ignition Coils and Heat Management
Symptom: Misfires under hard acceleration, power loss in hot weather, and misfire codes such as P0300–P0304.
Cause: High boost and high specific output wear out spark plugs faster than in ordinary engines. Heat soak also reduces performance on track days or in hot climates.
Severity: Low to moderate, but prolonged misfiring can damage catalytic converters and pistons on tuned engines.
Typical Mileage: Any mileage; plugs on tuned engines often need replacing every 12,500–18,500 miles (20,000–30,000 km).
Note: Colder spark plugs and an upgraded intercooler are common and effective fixes on modified cars.
Maintenance Schedule
| Service | Interval |
|---|---|
| Engine oil and filter | Every 5,000–6,000 miles (8,000–10,000 km) or 12 months (more often with track use) |
| Spark plugs | Every 18,500–25,000 miles (30,000–40,000 km) stock; 12,500–18,500 miles (20,000–30,000 km) if tuned |
| Air filter | Every 18,500–25,000 miles (30,000–40,000 km) |
| DCT transmission fluid and filter | Around every 37,000 miles (60,000 km), sooner with hard use |
| Transfer case and rear differential oil | Around every 37,000 miles (60,000 km) (recommended) |
| Brake fluid | Every 2 years, or before track days |
| Coolant | Check at every service; replace per Mercedes schedule |
| Engine mounts and boost hoses | Inspect at every service |
Recommended oil specification: A fully synthetic oil approved to MB 229.5, typically in 0W-40 or 5W-40, or as listed in the vehicle's service booklet.
Tuning Potential
The M133 is one of the most tuner-friendly modern Mercedes engines. Its strong bottom end handles considerable extra power, and software alone can deliver a meaningful jump. Beyond that, an upgraded turbo, intercooler and fueling allow very high outputs, though the 7-speed dual-clutch transmission becomes the main limiting factor. Figures below are typical estimates for the 381 hp version and vary by tuner and fuel.
| Stage | Modifications | Estimated Power |
|---|---|---|
| Stage 1 | ECU remap, transmission software | Around 400–420 hp |
| Stage 2 | Remap, downpipe (where legal), upgraded intercooler, intake | Around 420–450 hp |
| Stage 3 | Hybrid or larger turbo, fueling upgrades, transmission upgrades, custom calibration | Around 450–500+ hp |
Recommended first modifications in priority order:
- Full health check: compression, boost leaks, cam adjusters and mounts
- Colder spark plugs and fresh ignition coils
- Upgraded intercooler to control intake temperatures
- ECU and DCT transmission calibration from a specialist
- Uprated engine and transmission mounts
Heat and fuel quality are the main limits on a tuned M133: use high-octane fuel, consider an auxiliary cooling upgrade for track use, and keep oil change intervals short. The 7-speed DCT needs clutch-pressure and torque-limit adjustments to survive higher outputs. Remember that removing catalytic converters is illegal for road use in the EU, the UK and the US.
FAQ
Is the Mercedes-AMG M133 reliable?
At stock power and with proper maintenance, the M133 is a reasonably reliable engine with a strong bottom end. Most issues concern the transmission, mounts, turbo and camshaft adjusters rather than the engine's core.
What are the most common M133 problems?
The most commonly reported issues are dual-clutch transmission wear or mechatronic faults, engine mount wear, camshaft adjuster rattle and solenoid oil leaks, turbo wastegate rattle and spark plug wear.
How long does an M133 engine last?
A well-maintained stock M133 can exceed 124,000 miles (200,000 km). Engines that have been tuned aggressively, tracked or serviced irregularly may need major work much sooner.
How does the M133 compare to the M270 and M139?
The M133 shares its basic layout with the M270 used in regular A-Class, B-Class and CLA models, but it has a strengthened closed-deck block, forged crankshaft and much higher boost. Its successor, the M139, is a completely new design that is rotated 180 degrees in the engine bay and produces up to 421 hp in factory form.
What is the tuning ceiling of the M133?
Around 450 hp is widely regarded as a sensible upper limit on the stock turbo with supporting modifications. Larger turbo builds can exceed 500 hp, but they require significant investment in fueling, cooling and transmission upgrades.
Is a tuned M133 still daily-drivable?
Yes, a Stage 1 or mild Stage 2 car remains very usable day to day. Higher stages bring more heat, more transmission stress and higher running costs, so they are better suited to enthusiasts prepared for extra maintenance.
Conclusion
The Mercedes-AMG M133 is a landmark engine that turned the A-Class, CLA and GLA into genuine performance cars. Its core is strong and highly tunable, but used examples need careful inspection of the dual-clutch transmission, mounts, turbo and camshaft adjusters, as well as an honest account of any modifications. Pick a well-documented example and the M133 delivers outstanding performance for the money.
Overall Reliability Score: 6.5/10
Tuning Score: 9/10
Whether you are restoring factory freshness or building more power, explore our range of Mercedes-AMG replacement and performance parts for your A 45, CLA 45 or GLA 45.