Mercedes-Benz S350 oil leak issue from oil cooler plastic washers requiring costly repair on Mercedes-Benz S350

Some Mercedes-Benz S350 owners report experiencing oil leaks primarily related to the oil cooler and its components, such as seals and gaskets. These leaks often result from hardened seals between the oil filter housing and the engine oil cooler, which may require extensive disassembly for replacement. Common symptoms include disappearing oil levels and noticeable oil stains on driveways or garage floors. Repairing these oil cooler leaks can be labor-intensive, typically taking 6-8 hours, which contributes to the overall cost of the repair. Despite the potentially high expenses, it is crucial for owners to address these oil leak issues promptly to prevent further engine damage and ensure the vehicle's optimal performance and longevity.