I am selling my high-specification Mercedes-Benz GL 420 CDI after four years of ownership. While the vehicle has been rigorously maintained, it is being sold as a "spares or repairs" project due to an unresolved coolant leak that has recently led to overheating. Vehicle Highlights: The engine runs strongly with no signs of head gasket failure (no white smoke or milky oil). It is packed with premium factory options, making it an excellent candidate for a mechanical repair project or a high-spec parts donor. Premium Options: Heated/ventilated front seats, heated rear seats, tri-zone climate control, rear-seat DVD entertainment system, and full Off-Road Package. Recent Maintenance: New front tires, front brake discs/pads, recently replaced air suspension compressor, and repairs to the boot locking system and glow plug control relay. Known Issues: Cooling System: Persistent leak causing overheating. Despite replacing the water pump, serpentine belt, thermostat gasket, EGR cooler, and oil cooler seals, the issue remains. Access: The bonnet catch is currently stuck. Important Note to Buyers: Due to the overheating issue, the vehicle must be towed from its current location to avoid further engine damage. Please bring a trailer for collection. Mileage: ~139,000 miles. This is a fantastic opportunity for someone with the expertise to resolve the cooling issue or for a professional looking for a donor vehicle with a high-spec interior and recent mechanical upgrades. Serious inquiries only, please.