Mercedes-Benz W108/W109 (1965–1972)

The Mercedes-Benz W108 and W109 represent the pinnacle of Mercedes engineering in the late 1960s. Launched in 1965, the W108 replaced the Fintail saloons with a cleaner, more modern body while retaining the exceptional build quality that defined Mercedes of the era. The range encompasses six-cylinder models from the 250S through to the 300SE, and the magnificent V8-powered 280SE 3.5 and 300SEL 6.3. The W109 added the sophisticated air suspension system. The 300SEL 6.3, with its 6.3-litre V8 engine transplanted from the 600 Grosser, is one of the great sleeper performance cars of its era. All W108s benefit from simple, robust mechanicals and extensive club and specialist support. Rust in the rear lower quarters and sill areas is the primary concern on unrestored examples.

Available body styles: Saloon, Coupe (W111). Produced from 1965 to 1972.

Which variant to buy?

The W108/W109 was produced in 4 main variants. The most powerful option is the 300SEL 6.3 (M100) with 250 hp (M100.981 engine). When buying, always verify the engine code matches the claimed variant — swapped engines are common on classic cars of this era.

What to check before buying

Based on 3 reported fault cases, the most important pre-purchase checks for the W108/W109 are:

• W108 D-Jetronic fuel injection warm start failure ✅ Known fix available
• W108 automatic transmission selector shaft seal leak ✅ Known fix available
• W108 M116 V8 oil leak from timing cover ✅ Known fix available

Is the W108/W109 reliable?

Of the 3 fault cases recorded for the Mercedes-Benz W108/W109 on MyCarFault, 100% have a verified fix. Regular maintenance, correct service intervals and addressing known weak points early significantly extends the life of these vehicles.