Genuine OEM Volkswagen Base Engine, part number 028100035. This is the fundamental engine assembly, comprising the engine block, crankshaft, pistons, and connecting rods, forming the core of the powertrain. It is the main component of the engine. Manufactured with high-grade materials and precision engineering, this base engine is built for durability and performance. Choosing a genuine OEM base engine ensures that all components are perfectly matched and calibrated for optimal operation and longevity, maintaining the vehicle's original performance standards.