The 4 Typical Mercedes M272 Engine Issues. The Mercedes-Benz M272 V6 engine was designed to replace the M112, Mercedes’ first V6 engine. Mercedes’ previous 6-cylinder engines were all straight sixes. It is offered in a variety of Mercedes vehicles from 2004 to 2015, with displacements ranging from 2.5L to 3.5L. This page will go through frequent M272 engine problems, including symptoms and replacement.
M272 Mercedes-Benz Engine
Before we go into M272 engine failures, let’s go over the many models that use the M272 engine. It’s quite a comprehensive list. It’s also worth noting that certain years or models may be more or less prone to the issues we’ve discussed.
Engine E25 2.5L M272
The 2.5L M272 is found in the following Mercedes-Benz models:
- 2005-2007 W203 C230
- 2007-2009 W204 C230
- 2005-2009 W211 E230
- 2008-2011 CLC230
Engine: E30 3.0L M272
The 3.0L M272 engine is found in the following Mercedes-Benz models:
- 2004-2010 SLK280
- 2005-2010 W219 CLS280
- 2005-2010 C209 CLK280
- 2005-2007 W203 C280
- 2007-2009 W204 C280
- 2009-2011 W204 C300
- 2008-2012 GLK300
- 2005-2009 W211 E280
- 2009-2011 W212 E300
- 2005-2009 R230 SL280
- 2007-2013 W221 S280
Engine: E35 3.5L M272
At 3.5L, this is the largest M272 engine available, producing 268-302 horsepower. It is housed in the following Mercedes:
- 2004–2011 SLK350
- 2004–2010 W209 CLS350
- 2005–2010 C209 CLK350
- 2005–2007 W203 C350
- C350 / C350 4Matic 2007-2011
- C350 BlueEfficiency 2011-2015
- E350 2005-2009 / E350 4MATIC
- E350 / E350 4MATIC 2009-2011
- 2005–2013 W221 S350
- 2005–2012 R230 SL350
- 2006–2017 R350
- 2006–2011 W164 ML350
- 2008–2011 CLC350
- 2008–2012 GLK350
Problems with the Mercedes-Benz M272 Engine
The following are four of the most prevalent problems with the Mercedes M272 engine:
- Shaft of balance
- Manifold for the intake of air
- Thermostat
- Oil spills
Simply because these four issues are among the most common does not indicate that every M272 will have them. Furthermore, many M272 engines are already over a decade old. As with any old engine, a slew of potential issues emerge. You may encounter issues that are not addressed in this article. Anyway, let’s get started and go over each of the M272 issues listed above.
1) Mercedes M272 Shaft Balance Issues
This issue is certainly worthy of its own essay. Fortunately, M272 balancing shaft problems mostly impact early vehicles made between 2004 and 2008. Like most V8 engines, the M272 has a 90° V angle. However, this causes excessive vibration. To address these vibrations, Mercedes incorporated a balance shaft on the M272. Early engines’ balancing shaft sprockets were composed of flimsy materials. The M272 sprocket wears down over time, causing timing to be wrong.
This is a major problem that usually necessitates the removal of the engine. If the timing is too much out of whack, the M272 could fail completely. Metal shavings from the balancing shaft sprocket might also be problematic. When the balance shaft fails, a total loss of the M272 engine is not implausible. Furthermore, the expense of properly repairing the balancing shaft may exceed the cost of a replacement engine.
The point is, if you’re looking for a Mercedes M272 from 2004 to 2008, you should be aware of this concern. Ascertain that this repair was completed before and correctly. Mercedes rectified this issue on M272 engines built after 2009 by using stronger steel balancing shaft sprockets. The issue can still exist, however it is largely a concern with previous models.
Symptoms of Mercedes M272 Balance Shaft
Among the signs of an M272 balancing shaft failure are:
- Engine light on
- Codes for faults
- Rugged running
When the sprocket totally breaks, the check engine light will usually illuminate. Timing can be thrown off at this point, therefore fault codes should be connected with it. The following M272 balance shaft failure codes are possible: P0059, P0060, P0064, P0272, P0275, and P0276. Furthermore, poor timing will result in very choppy running. If you experience these symptoms, turn off the M272 engine and do not drive until the problems are resolved. If left alone, the harm may worsen.
M272 Replacement Balance Shaft
Replacing the M272 balancing shaft is a difficult task best left to skilled mechanics and do-it-yourselfers. The real repair kits cost between $400 and $500 in parts. Not awful, but the true issue is the labor. At a repair shop, this job can easily cost $2,000 or more. That is, provided no more engine damage happened as a result of the balancing shaft failure. While the engine is apart for sprocket repairs, you should consider replacing additional components.
2) Issues with the Mercedes M272 Intake Manifold
Another issue with potentially serious repercussions is the M272 intake manifold. The swirl flaps inside the intake manifold are a major failure point on the intake manifold. We’ll get to that shortly. Otherwise, take a look at the M272 manifold’s intricate design and all of the plastic. One place to look is at the two small black caps. The shafts inside the manifold may fail, resulting in the lever breaking and the caps popping off.
Apart from that, pieces of the swirl flaps may detach and enter the cylinders. This is a less common yet very significant issue. If the M272 manifold swirl flaps go into the engine, they may damage some internals. Once the flaps have passed through the engine, you will most likely need a valve work to repair any broken valves.
Symptoms of the M272 Intake Manifold
Among the most common signs of M272 intake manifold failure are:
- Engine light on
- Codes for faults
- Power outage
- Idle time
The intake manifold’s purpose is to properly distribute air to the cylinders. When parts on the M272 begin to degrade, airflow may become irregular or insufficient. This can result in check engine lights and error codes. P2004, P2005, and P2006 are some common trouble codes. Fault codes for O2 sensors, lean operation, or misfires are also possible. Another common sign is power loss, which occurs when cylinders do not receive adequate air. Finally, the uneven airflow may result in a harsh idle.
M272 Intake Manifold Repair
When these failures occur, it is usually advisable to replace the complete M272 manifold. There are repair kits available. They do not, however, address shaft issues on the inside of the manifold. To prevent failure, some repair kits employ stronger parts. While this is an option, it’s probably advisable to install the part upgrades on a new manifold to guarantee there are no existing concerns on the interior.
A new intake manifold costs between $600-700. You’ll have to spend a little more if you additionally want a repair kit to address the external failure spots. The M272 repair is rather simple, and intermediate DIYers should be able to complete it. Repair shop labor can vary depending on your model, region, and other factors. However, it normally takes 3-4 hours of labor, so add a few hundred dollars.
Failure of the Mercedes M272 Thermostat
Okay, we’ll move on to the rest of this topic quickly. Engine thermostat issues are most likely the most common issue on the M272. In comparison to the earlier M272 issues, the map-controlled thermostat is a fairly straightforward failure. These thermostats are programmed to maintain coolant temperatures between 185 and 221°F.
The M272 thermostat may malfunction in either the open or closed state. It may cause your engine to overheat if it is closed. When an open failure occurs, it takes a considerable time for the M272 to attain working temperatures. M272 thermostat issues often arise every 60,000 to 100,000 miles.
M272 Thermostat Problems and Replacement
Observe the following symptoms:
- Overheating
- It takes too long for the engine to heat up.
- Codes for faults
P0597, P0598, and P0599 are common trouble codes for M272 thermostat problems. Again, depending on the setting of the thermostat, overheating or taking too long to heat up may occur.
Fortunately, the thermostat is inexpensive, costing around $60. You’ll also need some coolant to top off the system after the repair. It’s a reasonably simple DIY project that anyone with basic knowledge and patience should be able to complete. It will take a few hours, so those going to repair companies should budget $150-300 for labor.
4) Oil Leaks in Mercedes-Benz M272
Oil leaks aren’t a regular issue with the Mercedes M272. Particularly when compared to the earlier M112 V6 engine. However, because to the age of the M272, oil leaks can and do occur. The electrical plugs for cam adjuster magnets are a crucial location to inspect. If oil escapes via the electrical connector, it can reach the engine harness. If the wiring harness is destroyed, this becomes an expensive repair.
Other typical oil leaks to watch out for are the oil cooler seals and the oil separator. Oil may get on the belt tensioner if the engine oil cooler seals leak. The oil separator features a plastic cover that deteriorates over time and mileage and may eventually spill oil.
Symptoms of an Oil Leak in a Mercedes M272
Oil leak signs are rather straightforward, but here are a few M272 oil leak symptoms:
- Visible dripping
- The odor of burning oil
- Smoke
- Engine oil is low.
Of course, precise symptoms vary depending on where the leak is located. A visible leak is a dead giveaway and is frequently the only visible indication. If oil is pouring onto hot parts, you may notice smoke or smell burning oil. A significant oil leak might cause engine oil to run out faster than expected.
Related : The Seven Most Common 7.3 Powerstroke Engine Issues
Mercedes-Benz M272 Dependability
How trustworthy is the Mercedes M272 engine? Overall, the M272 is less dependable than the ordinary car. It’s not all terrible, but there are a few severe faults that might result in expensive maintenance bills or engine failure. Fortunately, the pricey balancing shaft failures affect just the early 2004-2008 M272 engines.
Though unusual, intake manifold defects might cause major consequences. Thermostat failures are possibly the most common issue on the M272. However, it is a rather inexpensive and straightforward repair. Finally, while oil leaks aren’t widespread, they are probable given the age of most Mercedes M272 engines.
Again, just because we term certain issues common does not indicate that everyone will encounter them. Many M272s are also prone to a variety of other issues due to their age and mileage. Having said that, the M272 isn’t a bad engine by any means. The M272 should be able to reach 200,000 miles with proper maintenance and repairs.
M272 Summary of Common Issues
The M272 engine from Mercedes-Benz is a strong engine with solid performance for its era and naturally aspirated construction. However, all engines, including the M272, are prone to typical issues. Watch out for balancing shaft gear problems, which primarily affect 2004-2008 vehicles. Balance shaft failure is an expensive replacement in and of itself, and it may also cause additional engine damage. Another regular and costly repair on the M272 is intake manifolds.
The last two issues are minor because thermostats are inexpensive to repair and oil leaks are uncommon. However, the M272 is only getting older, and numerous faults become more common as it ages and accumulates mileage. While the M272 isn’t as reliable as the typical engine, it’s also not the worst. Check that it has been adequately maintained and that common problems have been resolved.
