The Guide to the Mercedes M112 V6 Engine. The Mercedes-Benz M112 engine was a four-stroke internal combustion V6 engine that was used in a variety of vehicles from 1998 until it was discontinued in 2015. This famous engine was Mercedes’ first V6, and it was quickly followed by the M113 V8, which was also released to the market in 1998. This article will go into the history of this engine and its various variants over time. We will also assess the M112’s dependability and longevity, as well as provide insight into any prospective modifications and mods that can increase power and performance.
The M112 V6 engine is widely considered as one of Mercedes’ most robust engines. For the same reasons, its predecessor, the M113, is a popular choice among daily drivers. However, there are several frequent recurring issues that drivers may encounter. Fortunately, many of the most common M112 problems do not necessitate extensive repairs or engine breakdowns. Interesting, given that many people believe Mercedes-Benz to be ordinary in terms of reliability when compared to other brands. This engine, however, is a favorite among many Mercedes drivers from earlier years. Let’s take a closer look at the Mercedes M112 V6 in general, beginning with a discussion of the engine’s dependability.
Reliability of the Mercedes M112 V6 Engine
Does the Mercedes M112 have a good reputation among Mercedes drivers only? Or how does this engine compare to others of similar size developed at the same era? That, like other autos, is subject to a variety of factors.
The M112 V6 has a history of frequent oil consumption concerns. However, these problems can be avoided with regular maintenance and fixes. This high oil consumption issue is frequently caused by worn valve stem seals; however, other engine defects can also be the trigger. The high use of oil is just an indication of oil leakage. It’s also critical to inspect the oil heat exchanger, which has a seal that frequently fails, resulting in those pesky oil leaks.
Another typical issue to note, which is also present in the M113 V8 variant, is harmonic balancer issues. A harmonic balancer is also widely known as a crankshaft pulley. This issue causes a harsh idle. Based on the average repair charges at national Mercedes shops, this repair can cost between $300 and $700 depending on the year and type.
Proper maintenance and repairs should significantly extend the life of the Mercedes M112 V6 engine. Changing your oil filter to a fleece filter, using high-quality oil, and being meticulous with repairs will turn the M112 from unreliable to dependable. When compared to comparable luxury car engines at the time, this engine is ordinary to above average in terms of longevity and durability. The M112 V6 engines, on the other hand, demand proper care and maintenance to obtain that above-average grade.
The Most Common M112 V6 Issues
In terms of design and functionality, the M112 has no obvious flaws. However, as with any engine, the flaws we highlighted necessitate adequate maintenance and care. Consistent maintenance and repairs lead to increased engine reliability and durability. In summary, the three most common difficulties with the Mercedes M112 V6 engine are as follows:
1) Issues with Oil Consumption
Oil leaks are common in most cars as they age and deteriorate, and the M112 V6 is no exception. With increased mileage, gasket seals and other rubber seals within the engine might crack and fail. Within the M112 V6, there are various catalysts for persistent oil leaks. fixes that are easily accessible, such as a leaking oil pan, or more difficult fixes, such as broken seals surrounding the oil heat exchanger, can all be the cause of oil consumption concerns. Check the wear on your M112 V6 valve stems as well, as these are a common source of oil leaks. Again, buying high-quality oil and performing constant proper maintenance can help to prevent many of these oil leaks and consumption issues.
2) M112 Harmonic Balance Issues/Failures
Problems with the harmonic balancer are more common in the M112 V6 than in many other Mercedes engines. Failures inside the harmonic balancer, also known as the crankshaft pulley, will result in a more rougher driving experience for your M112. Along with a rough idle and slower acceleration, harmonic balancer troubles could potentially mask more serious problems causing damage to your M112 engine. Given that this is probably our most expensive repair recommended for the Mercedes M112 V6, it’s critical to resolve this issue before it worsens and does further damage to your engine.
3) Intercooler Issues
It is crucial to note that the Mercedes M112 V6 (and M113 V8) might experience recurring intercooler difficulties, which can lead to engine overheating. If the intercooler pump fails, the system may work inefficiently, causing intake temperatures to rise. Higher intake temperatures cause poor engine performance and make the engine more brittle, resulting in a shorter engine lifespan.
Many of the issues we mentioned for the Mercedes M112 V6 have reasonably priced replacement components, especially if obtained from third-party manufacturers or sources. However, Mercedes labor costs tend to make these fixes more expensive. Labor costs, particularly at approved Mercedes-Benz dealerships, can be significantly higher than national norms for most other manufacturers.
Variations on the Mercedes M112 V6 Engine
Throughout its production run, the Mercedes-Benz M112 V6 was available in six different configurations. Each model listed below retains the basic base of the M112 V6 engine while gradually increasing displacement and power. A silicon and aluminum engine blockhead is used in these engines. The fundamental power specs for each M112 V6 variation are shown here, along with which models the engines were used in.
E24 Specifications
The E24 is powered by a 2.4L engine that generates 168 horsepower and 166 pound-feet of torque. The E23 engine is used in the models mentioned below.
- 1996–2000 W202 C 240
- 1998-2000 W208/C208 CLK 240
- 1998–2000 W210 E 240
M112 E26 Specifications
The E26 is powered by a 2.6L engine that generates 168 horsepower and 177 pound-feet of torque. The E26 engine is used in the following models:
- 2000–2002 W210 E 240
- 2000–2005 W203 C 240
- 2003–2005 W211 E 240
- 2002–2005 C209 CLK 240
E28 Specifications
The E28’s 2.8L engine generates 204 basic horsepower and 199 lb-ft of torque. The E28 engine is used in the following models:
- 1998–2000 W202 C 280
- 1998–2006 W220 S 280
- 1998–2002 W210 E 280
E32 Specifications
The E32 is a 3.2L engine with 215-224 base horsepower (depending on model) and 232 lb-ft of torque. The E32 engine is used in the following models:
- 2000–2005 C 320
- 1998–2005 E 320
- 1997–2006 G 320
- 1998–2002 S 320
- 1998–2003 ML 320
- 2000–2003 SLK 320
- 1998–2005 CLK 320
- Viano 3.0/Vito 119 (W639) 2003-2015
- Chrysler Crossfire (2004-2008)
M112 E32ML Specifications
The E32ML is a 3.2L version of the E32 engine. This variant is distinguished by the presence of a twin-screw type supercharger, which increases the engine’s output to 349 basic horsepower and 332 lb-ft of torque, making it the most powerful variant. The E32ML engine is used in the following models:
- 2001–2003 C 32 AMG
- 2001-2003 Mercedes-Benz SLK 32 AMG
- 2002 A 32K AMG
- Chrysler Crossfire SRT-6 2005-2006
E37 Specifications
The E37 is powered by a 3.7L engine that generates 232-241 basic horsepower and 254 lb-ft of torque. Finally, the E37 engine is used in the following models:
- 2003–2005 ML 350
- 2003–2006 S 350
- 2003–2006 SL 350
- 2004–2008 V 350
Modifications to the Mercedes M112 V6 Engine
There are numerous modifications available for the large vehicles powered by the Mercedes M112 engine. Turbo improvements, camshaft upgrades, and a solid tune are the most popular among M112 V6 owners looking to increase the power and performance of their engines. This section will look at and analyze some of the most popular Mercedes M112 modifications and upgrades. The following upgrades prioritize power gains, price, and benefits, such as enhancing engine longevity and durability.
ECU Mapping
Because of its cost and power increases, mapping (also known as remapping or “chipping”) is frequently advised for the Mercedes M112 V6. Remapping is the process of modifying the microchip of an electronic control unit to improve performance and therefore overwriting factory settings on the ECU. As a result, car mapping allows your engine to reach its maximum power potential without being limited by standard settings. In summary, this method will immediately improve the acceleration and speed of the Mercedes M112 V6 engine.
Upgrades for the Mercedes M112 Turbo
Upgrading the M112 V6 with a supercharger or another turbo can result in considerable horsepower and torque improvements. However, these turbo improvements can be costly and difficult to install properly. Many turbocharger upgrade projects for the M112 V6 might fail due to improper installation and driving tactics, resulting in severe engine damage and a hefty repair price (or possibly the need for an entirely new engine). Increasing the performance of the Mercedes M112 V6 engine with turbo improvements will undoubtedly result in the most substantial power gains. However, these modifications will be the most expensive and complicated choice on our list for the M112.
Modifications for tuning and support
A decent tune will considerably benefit any engine with aftermarket improvements and changes. The Mercedes M112 V6 engine is no exception, since a proper tune enhances the engine’s output greatly. Each additional modification or upgrade to your engine will necessitate a solid tune in order for these further mods to function properly. The above-mentioned ECU mapping is a tune since it modifies the car’s parameters to improve engine performance. Dyno tuning differs in that it focuses on balancing the engine’s performance in general rather than specifically on the ECU. It is critical to balance out those supportive alterations with appropriate tune when you boost horsepower and torque with M112 upgrades.
Upgraded intakes are one of the most popular mods for any automobile, let alone the M112 V6. An open intake allows for increased airflow, which results in higher power without spending an arm and a leg. There are numerous choices on the market for the numerous cars that use the Mercedes M112 V6 engine. This update should be one of the least expensive options on our list for the M112.
Related : The Six Common Cadillac Northstar Engine Issues
M112 Camshaft Performance Upgrades
Performance camshaft upgrades round out our list of the most common Mercedes M112 V6 adaptations. An updated camshaft has two advantages: improved air intake and lower exhaust emissions. Furthermore, by altering engine timing, performance cams significantly boost horsepower and acceleration for the M112 V6. Performance camshafts increase the timing of valve opening and shutting and control the flow of fuel and air into the engine. The engine can work considerably more effectively with improved timing and management of airflow and fuel, resulting in better fuel economy.
Summary of the Mercedes M112 V6 Engine Guide
The Mercedes M112 V6 engine was an iconic engine for the brand, lasting nearly 20 years before being phased out in 2015. Mercedes’ first V6 engine, the M112, was presented to the car market. The M112 V6’s dependability and longevity are heavily reliant on good maintenance and repairs. Furthermore, using high-quality oil on this engine will help it last longer. However, when compared to other similar engines in the premium car market, this engine has average to above-average reliability for everyday driving. Mercedes ruled out the M113 V8 in favor of the M112 V6. More information on increasing the engine longevity of your M112 can be found in our earlier post on the Mercedes M113 V8 engine troubles.
Oil consumption difficulties are frequent with the M112 V6 engine. First, inspect your valve stem seals for any potential leaks, since these are frequently the source of annoying oil leaks and excessive oil consumption. To avoid these problems, it is critical to conduct good maintenance and use high-quality oil. Another frequently mentioned issue was issues with the harmonic balancer. When in need of repair, the harmonic balancer, also known as the crankshaft pulley, can cause the engine to shake excessively. A faulty harmonic balancer can cause worn rod bearings and fractured crankshafts if not repaired properly.
The Mercedes M112 V6 engine is adaptable to changes. A solid tune and ECU mapping can lead to increased engine power and performance. Tuning is essential for the M112 V6 engine to operate at maximum capacity, especially if horsepower and torque are increased with improvements.
