The Mercedes-Benz 250S from the late 1960s often evokes a sense of nostalgia for those who appreciate classic automotive engineering. Having owned a 1966 model from new and driven it extensively for years, including towing across North America, I can offer a unique perspective on what it’s like to live with and maintain this vehicle as a used classic. While it may not boast the raw power of later models, the 250S holds its own charm and presents a rewarding experience, especially for the hands-on owner.
One of the most distinctive features of the 1967 250S is its transmission. Mercedes-Benz pioneered an innovative approach for its time, opting for a lock-up clutch system instead of a traditional torque converter in this early automatic gearbox. This design, a precursor to the lock-up clutches seen in American cars much later, was implemented to maximize power delivery from the engine. A small switch on the front carburetor, featuring a points-like mechanism, plays a crucial role. At idle, this switch disengages the clutch, allowing the engine to idle smoothly at a standstill. Once you accelerate and the engine reaches approximately 800-900 rpm, the clutch engages, and subsequent gear changes occur with the clutch locked. This system, while advanced for its era, is one aspect that potential owners need to understand.
The engine in the 1967 250S is another area that requires specific understanding. This 2.5-liter single overhead camshaft engine was a continuation of Mercedes-Benz’s long-standing philosophy of prioritizing longevity, a principle shared with Rolls-Royce during that period. These engines were built with generous tolerances, and a characteristic they became known for was oil consumption. Right from the factory, these engines were designed to burn oil. Blow-by gases would carry oil through the valve cover vent into the carburetors. Furthermore, the valve guides had minimal or no seals. This system effectively created a controlled oil leak, directing oil into the carburetors, from where it lubricated the pistons and valve components. At high speeds, exceeding 100 mph, oil consumption could reach as high as a gallon per thousand miles, while in city driving, a quart every couple of tanks of gasoline was typical. Despite this seemingly high oil consumption, these engines are remarkably durable, often accumulating hundreds of thousands of miles with minimal wear evident upon teardown.
However, this characteristic oil burning was not always well-received, particularly in the American market. This factor contributed to the relatively short period that this engine configuration was imported. Subsequently, Mercedes-Benz redesigned the engine, and while a 250 engine was later used in the 114 series cars, it was not the same engine found in the 1966 and 1967 250S models.
In terms of driving experience, the 1967 250S is surprisingly light for its size, making it an excellent car for cruising at speed. Its capability extends beyond comfortable highway driving; it’s also a capable workhorse. During my ownership, I used my 250S to tow a trailer carrying motorcycles across North America, demonstrating its robustness and touring ability. However, prospective owners must be aware of potential maintenance challenges. Finding mechanics familiar with the intricacies of the twin carburetors and the clutch-operated automatic transmission can be difficult. Many mechanics, unfamiliar with the engine’s inherent oil consumption, might mistakenly recommend unnecessary overhauls. It’s crucial to understand that oil consumption is often a normal characteristic of these engines, not necessarily a sign of malfunction.
For those considering a used 1967 Mercedes-Benz 250S, self-sufficiency in maintenance is a significant advantage. If you are comfortable performing your own repairs and maintenance, the 250S can be a rewarding classic to own. Beyond its mechanical aspects, the 250S stands out as one of the most aesthetically pleasing designs Mercedes-Benz has ever produced. Its elegant lines and classic Mercedes styling make it a vehicle that turns heads and offers a unique blend of vintage charm and robust engineering. In conclusion, the 1967 Mercedes-Benz 250S is a great car for enthusiasts who appreciate classic design and are prepared to engage with its unique engineering and maintenance needs.
