For those in the know, owning a Mercedes-Benz Bluetec diesel offers a unique blend of performance and efficiency. Drawing from real-world experience with both a 2008 E320 Bluetec (W211, 1st gen OM642) and a 2013 E350 Bluetec (W212, 2nd gen OM642), here’s a breakdown of key ownership aspects, focusing on maintenance and common issues you might encounter.
Addressing Common Concerns in Bluetec Mercedes Benz Models
Several key areas demand attention when maintaining a Bluetec Mercedes Benz, particularly as these vehicles age. Let’s delve into each system:
Oil Cooler Seals: A Preventative Measure for OM642 Engines
If you own a 1st generation OM642 engine, oil cooler seal leaks are not a question of “if,” but “when.” This isn’t a catastrophic issue, but requires proactive maintenance. With the right tools, including e-Torx sockets and a fuel injection line nut wrench, and guidance from the Mercedes-Benz WIS (Workshop Information System), this job is manageable for the DIY enthusiast. Kits containing all necessary seals, a swirl flap motor (essential for proper function), and breather puck are readily available online from suppliers like f c p e u r o dot com for around $600. Allocate a long weekend, and with careful planning, you can tackle this proactively.
AdBlue/DEF System: Relevant to Later Bluetec Mercedes Benz Models
It’s important to note that the earlier W211 diesel models do not utilize AdBlue or Diesel Exhaust Fluid (DEF). This system is more relevant to later Bluetec Mercedes Benz vehicles like the W212 E350 Bluetec. For W211 owners, a point of interest is the spare tire. All W211 diesels come with a donut spare. If a full-size spare is a must-have, consider a W210, the last Mercedes-Benz to include one as standard.
Front Suspension: Refreshing an Aging System in Bluetec Mercedes Benz
Given that any W211 Bluetec Mercedes Benz is now at least a decade old, front suspension work is likely due. The W211 suspension design differs significantly from older Mercedes models. It features coil-over shocks, simplifying disassembly with just a floor jack to support the spindle while disconnecting ball joints. However, ball joint replacement is less straightforward than in the W210. The W211 uses pressed-in ball joints, which are more challenging to replace compared to the W210’s easily separable 2-legged ball joints. Comprehensive front suspension overhauls are advisable as these vehicles age.
Transmission (722.9): Understanding the VGS Conductor Plate in Bluetec Mercedes Benz
Bluetech Mercedes Benz models from 2007-2009 often feature the 722.9 transmission. A known weakness in this system is the VGS (Vehicle Transmission Control) conductor plate. In the 722.9, the VGS integrates the transmission computer, unlike the earlier 722.6 where the computer was separate. Replacing the VGS conductor plate is not a DIY task, as it requires SCN coding to your specific vehicle, necessitating Mercedes-Benz Xentry diagnostics to “phone home” to the factory servers. Sensor failures on the VGS can cause limp mode. Dealer replacement can cost around $1850. For the adventurous, sensor replacement on the valve body (sensors available on platforms like eBay) is a lower-cost option, albeit more complex and requiring specialized transmission fluid.
Even with a seemingly healthy VGS, a dealer visit to read transmission adaptations is beneficial for assessing overall transmission health. Ensure the latest firmware is applied to both the VGS and ECU. Older firmware versions can cause rough downshifts, especially when the engine is cold, a problem addressed by updates. This firmware update service typically incurs about an hour of shop labor.
Motor Oil: Strict Adherence to MB 229.52 Spec for Bluetec Mercedes Benz Engines
Using the correct motor oil is paramount for Bluetec Mercedes Benz diesel engines. It is crucial to exclusively use Mercedes-Benz Sheet 229.52 oil, or its predecessors 228.51 or 229.51. Incorrect oil can damage the particulate filter. Mobil 1 ESP oil is Mercedes-Benz recommended and specification compliant. While typically priced around $10/quart, keep an eye out for sales at retailers like NAPA, where Mobil 1 products are occasionally discounted.
Audio/Electronics: Navigating COMAND and Bluetooth in Older Bluetec Mercedes Benz
Many W211 Bluetec Mercedes Benz models were equipped with the P1 package, including COMAND with Navigation. While Mercedes-Benz no longer releases map updates for these older systems, 2014 update disks can be found affordably on platforms like eBay. Despite a somewhat dated user interface, the navigation remains functional and automatically sets the instrument cluster clock. Check the rear center console for the cell phone Bluetooth adapter stick. Originally designed for a Nokia phone, a dummy adapter was later released for Bluetooth pairing with modern phones, supporting hands-free calling but not A2DP music streaming. However, a 1/8-inch aux input in the glove box (at least in later W211 models) offers an alternative for audio streaming. Bluetooth A2DP adapters with 12V power leads are available online. These can be wired into the aux input, bypassing the original 1/8-inch jack for streamlined Bluetooth audio. Note that using both the MB Bluetooth for calls and a separate A2DP adapter for music might require careful phone configuration, especially with iPhones. Android devices generally offer more granular control over Bluetooth protocol assignments.
Rust and Brakes: Improvements in the W211 Bluetec Mercedes Benz
Mercedes-Benz addressed the notorious rust issues of the W210 in the W211 generation. Opting for a 2007-2009 W211 Bluetec Mercedes Benz brings the benefit of traditional ABS brakes, replacing the Sensotronic Brake Control (SBC) system found in earlier models. Consequently, these models do not have the auxiliary motorcycle battery under the air filter, simplifying the electrical system with just the main battery in the trunk.
Conclusion: Enjoying Your Bluetec Mercedes Benz
Owning a Bluetec Mercedes Benz, especially models with the OM642 engine, offers a rewarding experience for those prepared for proactive maintenance. By understanding these common areas and addressing them diligently, you can ensure years of reliable and enjoyable driving.
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