What component of an auto engine is the vibration damper fastened to?

The vibration damper is specifically designed to reduce engine vibrations and is fastened to the crankshaft. The crankshaft is a central component in an internal combustion engine, responsible for converting linear motion from the pistons into rotational motion that ultimately powers the vehicle. Since it experiences significant forces and torque during the engine's operation, attaching the vibration damper directly to the crankshaft allows it to effectively minimize the torsional vibrations generated during these processes.

This connection helps to extend the life of engine components and improve overall performance by maintaining smoother operation. In contrast, other components like the camshaft, flywheel, and oil pan do not serve the same purpose or experience the same kind of vibrational stresses in relation to the engine's operation as the crankshaft does. Thus, the crankshaft is the correct answer for where the vibration damper is fastened.