Mercedes-Benz M272 engine

E25

The E25 is a 2496 cc version. Bore and stroke dimension is 88x68.4 mm. Output is 204 PS at 6100 rpm with 245 Nm of torque at 2900-5500 rpm.

Applications:

• 2005–2007 W203 C 230 (M272 929 for flex fuel vehicles with the ethanol option)
• 2007–2009 W204 C 230
• 2005–2009 W211 E 230
• 2004–2011 CL203 C 230 SportCoupé & CLC 230
• 2010–2012 W639 Viano (Chinese market; known as the M272 924)
• 2010–2011 W639 Vito (Chinese market; known as the M272 924)

E30

The E30 is a 2996 cc version. Bore and stroke is 88x82 mm. Output is 231 PS at 6000 rpm with 300 Nm of torque at 2500-5000 rpm.

Applications:

• 2004–2010 SLK 280 (R171)
• 2005–2010 CLS 280 / CLS 300 (C219)
• 2005–2010 CLK 280 (C209)
• 2005–2007 C 280 / C 280 4MATIC (W203)
• 2007–2009 C 280 / C 280 4MATIC (W204)
• 2009–2011 C 300 / C 300 4MATIC (W204)
• 2008-2012 GLK 300 4MATIC (X204)
• 2005–2009 E 280 / E 280 4MATIC (W211)
• 2009–2011 E 300 (W212)
• 2005–2009 SL 280 (R230)
• 2005–2013 Vito (W639)
• 2006–2009 R 280 (W251)
• 2007–2013 S 300 (W221)
• 2013–2015 Viano (W639) (Chinese market)
• 2013–2015 Vito (W639) (Chinese market)

E35

The E35 is a 3498 cc version. Bore and stroke dimension is 92.9x86 mm. Output is 272 PS at 6000 rpm with 350 Nm of torque at 3500 rpm. A direct injected variant debuted in 2006 under the name Stratified-Charged Gasoline Injection (CGI). First fitted to the CLS350 CGI, it produces 292 PS and 365 Nm of torque while lowering fuel consumption. In 2008, the non-CGI engine was uprated to 316 PS at 6500 rpm and 360 Nm of torque at 4900 rpm with 350 Nm being delivered at 2000 rpm. This was achieved by raising the rev-limit to 7200 rpm, increasing the compression ratio using enhanced, weight-optimized pistons with a curved surface, reinforcements in the area of the piston pins, deeper pockets for the valve seats, single-stage intake manifold, lightweight valves with sodium cooling, conical valve springs, tri-oval chain sprocket, and a new cylinder head.[[File:M272 IN SLK R171.jpg|thumb|3.5 L M272 engine in a 2005 SLK 350]]Applications:

• 2004–2011 R171 SLK 350[[File:M272 TMS2005 01.JPG|thumb|Front view of a 3.5 L M272 engine]]
• 2004–2010 W219 CLS 350
• 2005–2010 C209 CLK 350
• 2009–2011 C207 E350
• 2005–2007 W203 C 350 / C 350 4MATIC
• 2007–2011 W204 C 350 / C 350 4MATIC
• 2005–2009 W211 E 350 / E 350 4MATIC
• 2009–2011 W212 E 350 / E 350 4MATIC
• 2005–2011 W221 S 350 / S 350 4MATIC
• 2005–2012 R230 SL 350
• 2006–2017 W251 R 350
• 2006–2011 W164 ML 350
• 2005–2014 W639 Viano (known as the M272 978 in China)
• 2006–2013 NCV3 Sprinter
• 2005–2011 CL203 C 350 SportCoupé & CLC 350
• 2008–2012 X204 GLK 350 4MATIC

Balance shaft gear and other issues

M272 engines that were sold between 2004 and 2007 with engine serial numbers below 2729..30 468993 often show early wear of the balance shaft gears, requiring extensive repairs at a retail cost of over $4,000. These complaints led to a class action lawsuit against Mercedes-Benz (Greg Suddreth and Paul Dunton v. Mercedes-Benz USA, LLC), which alleged the M272 engines are equipped with defective balance shafts gears which "wear out prematurely, excessively and without warning, purportedly causing the vehicles to malfunction, the check engine light to illuminate and the vehicle to misfire and/or stop driving." The suit further alleged that Mercedes knew of this problem, sending out repair bulletins on how to address this issue and ultimately changing the balance shaft gears to avoid this problem. This suit was ultimately dismissed with the judge agreeing with Mercedes that because the gears fail at 60 -80K miles and outside of the warranty period, Mercedes is not legally responsible for these problems.

However, a second class action lawsuit was filed in October 2012 in Northern California, covering Mercedes-Benz models manufactured between 2005 and 2007. A preliminary settlement was reached on April 8, 2015, which would see owners compensated for up to 70% of the cost of the repair.

These engines also have a common issue with their intake manifolds. The M273 also has similar issues but not to the same extent. The plastic lever that operates the opening and closing of the variable length intake manifold can break prematurely. Mercedes doesn't have this particular part listed, instead they sell the whole intake manifold as one unit which can cost upwards of $800 US. There are a number of third-party companies that sell a replacement lever made out of metal at a much cheaper cost.

References

References

1. O'Donnell, Matt. (15 October 2010). "Mercedes M272 & M273 Engine Class Action".
2. (29 October 2012). "Mercedes-Benz named in class action over safety issues related to its M272 or M273 engines". Got a Class Action?.
3. Konigstiger. "How to interpret Balance Shaft Sprocket Engine Serial #?".
4. (30 January 2012). "Mercedes-Benz M272 Balance Shaft Failure".
5. O'Donnell, Matt. (15 October 2010). "Mercedes M272 & M273 Engine Class Action".
6. Jackson, Russell. "District Court Dismisses Automotive Class Action".
7. (29 October 2012). "Mercedes-Benz named in class action over safety issues related to its M272 or M273 engines". Got a Class Action?.
8. "Order by Judge Thelton E. Henderson granting 142 Motion for Preliminary Approval of Class Action Settlement. Motion for Final Approval due 08/03/2015. (Filed on 4/8/2015)".