Bilstein 22-306609 Suspension Strut Assembly - Front Left

Bilstein B4 OE Replacement Front Left Strut

The Bilstein B4 OE Replacement front left suspension strut is built to restore original ride quality and handling on select BMW applications. This Bilstein shock absorber is engineered to meet or exceed OE standards while maintaining the factory driving feel.

Compatible with BMW 230i, 430i, 330e, 330i, and M340i front left applications listed below, part number 22-306609 is a direct-fit suspension strut assembly for sport suspension setups without electronic suspension.

Key Features

• Bilstein B4 OE Replacement series for factory-style ride restoration
• Front left suspension strut assembly
• Twintube internal design
• Black paint finish
• Stem upper mount and base cup lower mount
• No boot included
• OE-style replacement for select BMW sport suspension applications

Product Line Details

The Bilstein B4 OE Replacement line focuses on restoring original suspension behavior rather than changing the vehicle’s character. For drivers of BMW 330i, BMW 430i, and related models, this line provides an OE-matching approach for maintaining factory ride comfort and steering response.

Detailed Description

Bilstein part number 22-306609 is a front left suspension strut assembly designed for BMW vehicles equipped with sport suspension and without electronic suspension. It uses a twintube construction with a stem upper mount and base cup lower mount, making it a direct replacement for the original front left damper on the listed applications. This part cross-references BMW OE numbers 31 31 6 879 305 and 31 31 6 888 455 for the same application.

Fits 2022-2025 BMW 230i, Front Left; Fits 2021-2025 BMW 430i, Front Left; Fits 2021-2024 BMW 330e, Front Left; Fits 2019-2024 BMW 330i, Front Left; Fits 2020-2024 BMW M340i, Front Left.

Common Issues This Part Can Address

• Front-end ride quality that has become harsh or inconsistent
• Reduced handling precision from a worn original strut
• Excessive bouncing or poor damping control
• Noise or instability from a fatigued front left suspension unit
• Loss of factory-like steering response on sport suspension models

Installation Notes and Tips

Verify that your BMW is equipped with sport suspension and does not use electronic suspension before ordering. Confirm the front left position and compare the original mount style and OE part numbers before installation. Professional installation and a post-installation alignment are recommended after replacing a suspension strut assembly.

Quality Assurance

Bilstein manufactures the B4 OE Replacement series to meet or exceed OE standards for factory-style performance and durability. Part number 22-306609 is built for consistent fitment and dependable suspension restoration on the listed BMW applications.