Bosch 3974 Engine Oil Filter

Reliable Engine Oil Filtration for Subaru Vehicles

The Bosch Premium Oil Filter 3974 is designed to provide effective engine oil filtration for a range of Subaru models. Engineered with quality materials and essential features, this spin-on oil filter helps maintain engine performance and longevity.

• Filter media made from cellulose paper for efficient contaminant capture
• Spin-on design with M20x1.5 inside thread size for secure installation
• Includes anti-drain back valve to prevent dry starts
• Bypass relief valve rated for 200 PSI burst pressure
• Nitrile gasket material for reliable sealing
• Compatible with multiple Subaru models including Ascent, Forester, Outback, and WRX

About the Bosch Premium Oil Filter Line

The Bosch Premium Oil Filter line focuses on delivering dependable filtration performance using quality materials and design features. The 3974 model incorporates cellulose paper filter media and essential valves to protect your engine from contaminants and maintain oil flow under various conditions. This product line is engineered to meet the filtration needs of modern engines while ensuring compatibility with specific vehicle applications.

Product Details and Specifications

The Bosch 3974 oil filter features a spin-on/canister type design with a height of approximately 2.58 inches and an outside diameter of 2.677 inches. The filter media is made from cellulose paper, which effectively traps particles down to 20 microns. The anti-drain back valve prevents oil from draining out of the filter when the engine is off, reducing wear during startup. Additionally, the bypass relief valve ensures continuous oil flow if the filter becomes clogged, with a burst pressure rating of 200 PSI. The nitrile gasket material provides a secure seal to prevent leaks. The filter’s connection size and inside thread size are both M20x1.5, ensuring proper fitment on compatible Subaru engines.

Compatible Subaru Models and Applications

• Subaru Ascent
• Subaru Baja
• Subaru Crosstrek and XV Crosstrek
• Subaru Forester
• Subaru Impreza
• Subaru Legacy
• Subaru Outback
• Subaru WRX and WRX STI

Common Issues Addressed by Bosch 3974 Oil Filter

• Prevents engine wear caused by contaminants in the oil
• Reduces risk of oil starvation during engine startup with anti-drain back valve
• Maintains oil flow under high pressure with bypass relief valve
• Ensures proper sealing to avoid oil leaks
• Helps maintain engine performance and longevity in Subaru vehicles

Installation Notes and Tips

When installing the Bosch Premium Oil Filter 3974, ensure the engine is cool and the old filter is properly removed. Apply a thin layer of clean engine oil to the nitrile gasket before threading the new filter onto the engine. Tighten the filter by hand until the gasket contacts the mounting surface, then follow vehicle manufacturer torque specifications if available. The spin-on design with M20x1.5 thread size allows for straightforward installation on compatible Subaru models.

Quality Assurance and Warranty

Bosch maintains strict quality control standards for the Premium Oil Filter line, including the 3974 model. The filter is designed to meet or exceed OEM specifications for filtration efficiency and durability. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support reliable engine protection.