Major Service parts represent essential components used during comprehensive vehicle maintenance, typically performed at scheduled intervals to ensure optimal performance and longevity. These parts cover a wide range of systems including engine, drivetrain, braking, and cooling, preventing premature wear and potential failures. Common applications include replacing worn filters, belts, hoses, fluids, and critical wear items to restore vehicle systems to factory specifications. For example, this category includes engine oil filters like the Bosch 3397011549, air filters for intake systems, and coolant hoses such as those offered by Scania (MPN 2753171). Comprehensive major service kits can also encompass timing belts, water pumps, and even clutch components as found in MAN parts like 81903106018 or 51.95800-7520. Maintaining these systems with quality Service Parts > Major Service components is vital for both passenger cars and commercial vehicles.