The 2001 Mercedes-Benz S600, a beacon of luxury and power, represents the pinnacle of automotive engineering from the early 2000s. Housing the formidable M137 V12 engine, this S-Class variant delivered breathtaking performance and an opulent driving experience. However, prospective and current owners must be aware of the significant maintenance demands that come hand-in-hand with such sophisticated machinery, particularly as these vehicles age. While the allure of a V12 Mercedes-Benz is undeniable, understanding the potential pitfalls is crucial for a realistic ownership experience.
Common Maintenance Concerns for the 2001 S600 M137 Engine
Owners of the 2001 S600 often encounter a recurring set of maintenance issues, many of which can become costly if not addressed proactively. Several components are known to have a limited lifespan, requiring replacement around the 40,000-mile mark. These are some of the most commonly reported problems:
Ignition System: Coil Packs, MAP Sensor, and ECI Unit
The ignition system is a frequent source of expense. Both coil packs are prone to failure, with retail prices averaging between $936 and $1200 each. Adding to this, the Manifold Absolute Pressure (MAP) unit, costing around $250 from dealerships or $150 for Bosch replacements, and the Engine Control Ignition (ECI) unit, priced at approximately $800, contribute to potentially hefty bills.
Active Body Control (ABC) System: Pump, Struts, and Fluid
Mercedes-Benz’s advanced Active Body Control (ABC) system, while providing exceptional ride quality, is notorious for its maintenance needs. The ABC pump itself can fail, incurring costs from $914 to $1200 for retail units, or around $650 for rebuilt options. Furthermore, the Pentosin fluid, essential for the ABC system, requires approximately 10 cans at around $50 each from dealerships or $20 from suppliers like O’Reilly Auto Parts. The ABC filter, costing about $30, should also be regularly replaced. Perhaps most significantly, the ABC struts, with four in total, are known to fail and can cost around $2000 per strut to replace.
Oil Leaks and Sensors: Wire Harness, Oil Pressure Sensors, and Spark Plug Gaskets
Oil leaks are a common headache, particularly from the oil pressure sensor. If left unattended, oil can seep into the wire harness, potentially damaging upstream oil sensors. These sensors cost around $185 from dealerships or $80 for Bosch equivalents, and there are four in total. Replacing one of these sensors can be particularly challenging, often requiring the removal of a coil pack, which then necessitates the replacement of 12 spark plug gaskets at roughly $6-12 each. Furthermore, the 24 spark plugs themselves will eventually need replacement, adding to the overall maintenance costs.
Engine Mounts and Suspension Bushings
The engine mounts are also susceptible to collapse, costing around $100 each. Replacing them is a labor-intensive job, requiring engine lifting and, on the left side, removal of the manifold, ABC pump, and air conditioning compressor. Additionally, the front control arm rubber bushings tend to deteriorate. If not caught in time, this deterioration can lead to damage to the subframe, increasing repair complexity and expense.
Oil Cooler Leak: A Major Undertaking
The most significant and labor-intensive issue is often an oil cooler leak. This repair is a major undertaking, requiring the removal of the engine heads to access the cooler mounted underneath. This job can easily cost between $5000 and $7000 if performed by a professional mechanic, highlighting the complexity and expense associated with maintaining the M137 engine.
DIY Repair Considerations for the 2001 Mercedes-Benz S600
Given the high costs associated with professional repairs, a DIY approach can be appealing for mechanically inclined owners. However, tackling maintenance on a 2001 S600 requires specific knowledge, tools, and resources. It is highly recommended to:
- Invest in a Code Reader: Essential for diagnosing issues and understanding fault codes.
- Obtain a WIS Manual: A CD or online access to the Mercedes-Benz Workshop Information System (WIS) manual is invaluable for detailed repair procedures and specifications.
- Stock Pentosin Fluid and Electrical Cleaner: Keeping a supply of Pentosin fluid for the ABC system and electrical plug cleaner aerosol is advisable for regular maintenance and troubleshooting.
While DIY repairs can save money, they demand time, patience, and a willingness to learn the intricacies of the M137 engine and the W220 S-Class.
Conclusion: Embrace the Beast with Realistic Expectations
The 2001 Mercedes-Benz S600 offers a unique blend of luxury and performance, powered by a magnificent V12 engine. However, potential owners must enter into ownership with open eyes regarding the maintenance demands. While the driving experience can be rewarding, neglecting the potential for costly repairs can lead to significant financial burdens. By being informed, prepared, and potentially embracing a DIY approach, enthusiasts can continue to enjoy the power and prestige of the 2001 S600, understanding the realities of maintaining this iconic V12 flagship.
