Bosch 3421 Engine Oil Filter

Reliable Engine Oil Filtration for Audi, BMW, and Volkswagen

The Bosch Premium Oil Filter 3421 is engineered to provide dependable engine oil filtration for a range of vehicles including Audi, BMW, Chrysler, Dodge, Hyundai, Plymouth, Porsche, and Volkswagen models. Designed with quality cellulose paper filter media and essential features like an anti-drain back valve, this spin-on oil filter helps maintain engine performance and longevity.

Key Features of Bosch Premium Oil Filter 3421

• Filter media material: durable cellulose paper for effective contaminant capture
• Spin-on filter type with 3/4-16 inside thread size for secure installation
• Anti-drain back valve to prevent dry starts and maintain oil pressure
• Bypass relief valve rated at 25-35 PSI to ensure oil flow under high pressure
• Micron rating of 20 for efficient filtration of engine oil particles
• Nitrile gasket material for reliable sealing and leak prevention
• Compact dimensions: 4.74 inches height and 2.953 inches outside diameter

About the Bosch Premium Oil Filter Line

The Premium Oil Filter line from Bosch focuses on delivering consistent filtration performance using high-quality materials and design features. The 3421 model incorporates cellulose paper filtering media combined with critical valves to protect engine components by maintaining clean oil flow. This product line is tailored for drivers seeking reliable engine protection across multiple vehicle makes and models.

Detailed Product Description

The Bosch Premium Oil Filter 3421 is a spin-on type filter designed to fit various European and American vehicles such as Audi 80 Quattro, BMW 325i, Volkswagen Golf, and Porsche 924. Its cellulose paper filter media effectively traps contaminants down to 20 microns, helping to prevent engine wear. The anti-drain back valve minimizes oil starvation during cold starts, while the bypass relief valve ensures continuous oil flow even if the filter becomes clogged. The nitrile gasket provides a secure seal to prevent leaks, and the filter’s dimensions and thread size ensure compatibility with specified vehicle models.

Common Applications and Issues Addressed

• Maintains clean engine oil to reduce wear on moving parts
• Prevents oil starvation during engine startup with anti-drain back valve
• Ensures oil flow under high pressure with bypass relief valve
• Reduces risk of engine damage caused by clogged or inefficient filters
• Helps maintain engine performance and fuel efficiency

Installation Notes and Tips

• Ensure the correct part number 3421 is selected for your vehicle make and model
• Check the gasket surface for cleanliness before installation to prevent leaks
• Hand-tighten the spin-on filter and then follow manufacturer torque specifications if available
• Replace the oil filter during every oil change for optimal engine protection

Quality Assurance and Warranty

Bosch Premium Oil Filters are manufactured to meet strict quality standards, ensuring reliable filtration and durability. The 3421 model includes features such as a burst pressure rating of 200 PSI and robust valve components to maintain performance under demanding conditions. Warranty details should be confirmed with the original equipment provider or Bosch documentation.