{"id":29767,"date":"2026-03-01T15:42:58","date_gmt":"2026-03-01T15:42:58","guid":{"rendered":"https:\/\/amgclassicsupply.com\/?post_type=product&p=29767"},"modified":"2026-03-01T15:42:58","modified_gmt":"2026-03-01T15:42:58","slug":"low-mileage-m120-6-0-liter-v12-engine-20000-miles-complete-drop-in-with-updated-harness","status":"publish","type":"product","link":"https:\/\/amgclassicsupply.com\/index.php\/product\/low-mileage-m120-6-0-liter-v12-engine-20000-miles-complete-drop-in-with-updated-harness\/","title":{"rendered":"Low-Mileage M120 6.0 Liter V12 Engine (20,000 Miles) \u2013 Complete Drop-In with Updated Harness"},"content":{"rendered":"

Offered here is an exceptionally rare and highly desirable M120 6.0-liter V12 engine<\/strong> with only 20,000 documented miles.<\/p>\n

The legendary Mercedes-Benz M120<\/span><\/span><\/strong> represents one of the most advanced naturally aspirated V12 powerplants of the 1990s. Engineered by Mercedes-Benz<\/span><\/span><\/strong>, the M120 is renowned for its smooth power delivery, overbuilt construction, and immense tuning potential.<\/p>\n

This example is complete, documented, and features an updated wiring harness<\/strong>, eliminating one of the common aging concerns associated with early M120 engines.<\/p>\n

\n

Technical Highlights<\/h2>\n
    \n
  • \n

    6.0-liter naturally aspirated V12<\/p>\n<\/li>\n

  • \n

    48 valves (DOHC configuration)<\/p>\n<\/li>\n

  • \n

    Approximately 389\u2013400+ horsepower (factory spec dependent on application)<\/p>\n<\/li>\n

  • \n

    Massive torque output with effortless delivery<\/p>\n<\/li>\n

  • \n

    Legendary smoothness and balance<\/p>\n<\/li>\n<\/ul>\n

    The M120 powered flagship models such as:<\/p>\n

      \n
    • \n

      W140 S600<\/p>\n<\/li>\n

    • \n

      R129 SL600<\/p>\n<\/li>\n

    • \n

      C140 CL600<\/p>\n<\/li>\n<\/ul>\n

      It also served as the foundation for high-performance AMG variants and exotic applications.<\/p>\n

      \n

      Condition & Value<\/h2>\n

      This unit:<\/p>\n

        \n
      • \n

        Shows only 20,000 documented miles<\/p>\n<\/li>\n

      • \n

        Comes complete and ready for installation<\/p>\n<\/li>\n

      • \n

        Features updated engine wiring harness<\/p>\n<\/li>\n

      • \n

        Has been properly preserved and maintained<\/p>\n<\/li>\n<\/ul>\n

        Low-mileage M120 engines are becoming increasingly difficult to source, especially complete examples with documentation.<\/p>\n

        \n

        Perfect For<\/h2>\n
          \n
        • \n

          W140 S600 restorations<\/p>\n<\/li>\n

        • \n

          R129 SL600 builds<\/p>\n<\/li>\n

        • \n

          C140 CL600 projects<\/p>\n<\/li>\n

        • \n

          AMG 6.0 conversions<\/p>\n<\/li>\n

        • \n

          Custom V12 swaps<\/p>\n<\/li>\n

        • \n

          Investment-grade parts collectors<\/p>\n<\/li>\n<\/ul>\n

          Whether restoring a flagship Mercedes or planning a high-end performance build, this engine represents a serious foundation.<\/p>\n

          \n

          Collector & Investment Appeal<\/h2>\n

          The M120 is widely regarded as one of the last \u201coverengineered\u201d Mercedes V12s. As 1990s flagship models rise in collectibility, original low-mileage engines are becoming premium assets.<\/p>\n

          Reasons this engine stands out:<\/p>\n

            \n
          • \n

            Extremely low documented mileage<\/p>\n<\/li>\n

          • \n

            Updated wiring harness (major reliability advantage)<\/p>\n<\/li>\n

          • \n

            Complete configuration<\/p>\n<\/li>\n

          • \n

            Increasing global demand for V12 powertrains<\/p>\n<\/li>\n<\/ul>\n

            Naturally aspirated V12 engines from this era are no longer produced \u2014 making preserved examples increasingly valuable.<\/p>\n","protected":false},"excerpt":{"rendered":"

              \n
            • Chassis: Parts<\/li>\n
            • Transmission: Automatic<\/li>\n
            • Seller: Private<\/li>\n
            • 20k-mile 6.0L V12<\/li>\n
            • Updated Wiring Harness<\/li>\n
            • Spark plugs and wires<\/li>\n
            • Intake manifold<\/li>\n
            • Exhaust manifolds<\/li>\n
            • Engine mounts<\/li>\n
            • Serpentine belt<\/li>\n
            • Pulley<\/li>\n
            • Compressor<\/li>\n
            • Alternator<\/li>\n
            • Power steering pump<\/li>\n<\/ul>\n","protected":false},"featured_media":29781,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[80],"product_tag":[],"class_list":{"0":"post-29767","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-engine","8":"first","9":"instock","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29767","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/comments?post=29767"}],"version-history":[{"count":1,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29767\/revisions"}],"predecessor-version":[{"id":29783,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29767\/revisions\/29783"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/media\/29781"}],"wp:attachment":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/media?parent=29767"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_brand?post=29767"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_cat?post=29767"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_tag?post=29767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}