The Mercedes-Benz M113 engine. For those in the know, the name itself evokes images of robust engineering and relentless reliability. It’s often said that the M113 is simply an M112 engine with two extra cylinders, and in essence, that’s true. But this slight alteration created a V8 powerhouse that has proven its longevity time and again.
You see countless examples, particularly in the W220 S-Class models, where the vehicle around the engine may show its age or suffer from neglect, yet the M113 and its accompanying transmission soldier on without complaint. Stories abound of Mercedes S430s and S500s, powered by the M113, clocking over 300,000 miles and still running strong. These engines are built to last, leading many to question why Mercedes transitioned away from them in favor of the M272 and M273 series. Frankly, to truly break an M113, you’d almost have to try deliberately.
Speaking of transmissions, the pairing in these older Mercedes models further contributes to their reputation for durability. In the 4Matic W220 S-Classes, Mercedes wisely utilized the exceptionally dependable 722.6 five-speed automatic transmission. It was only the rear-wheel-drive versions from 2004 onwards that adopted the newer 722.9 seven-speed. The early iterations of the 7-speed gearbox, specifically the 722.9, were known to have valve body issues. Therefore, for those considering older Mercedes SUVs like the W163 ML-Class, it’s beneficial if earlier models retain the 5-speed for ultimate reliability.
Regarding the W163 ML-Class SUV and engine bay accessibility, consider the ML320. Working under the hood of the ML320 is surprisingly spacious, comparable to the generous room in a W220 S-Class. While it can be a touch tighter on the sides, overall, maintenance access is quite good. The ML500, housing the larger V8 M113, naturally presents slightly less space due to the engine’s wider configuration. In practical terms, this might mean that tasks you could perform without removing the radiator fan in an ML320 might necessitate fan removal in the ML500 to gain sufficient working room.
In conclusion, the M113 Mercedes engine stands as a testament to over-engineering in the best possible way. Its robust design and proven track record solidify its place as a legend in the automotive world, a powerhouse that continues to impress with its enduring strength and reliability.
