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2009 Mercedes-Benz S320 CDI Guide: Performance, Reliability, and 2026 Ownership

"The 2009 Mercedes-Benz S320 CDI remains a benchmark for luxury diesel executive sedans, offering a blend of torque-rich performance from its 3.0-liter OM642 V6 engine and world-class ride quality via the Airmatic suspension system. In 2026, it is valued as a high-tier used classic that requires specialized maintenance but rewards owners with timeless comfort. The W221 Generation: Context and 2009 Significance The 2009 Mercedes-Benz S320 CDI belongs to the W221 generation, which many enthusiasts and engineers consider the return to form for Mercedes-Benz after the electronic and build-quality struggles of the previous W220. By 2009, Mercedes h..."

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