Bilstein 31-31-6-786-013 B4 OE Replacement Front Left Suspension Strut Assembly

The Bilstein 31-31-6-786-013 is a B4 OE Replacement front left suspension strut assembly engineered to restore factory ride quality and handling to your BMW. Sold under Bilstein part number 22-136572, this strut is a direct OEM replacement designed to meet or exceed original equipment standards.

Built using Bilstein's proven twin-tube, gas-pressurized technology, the B4 series delivers a ride quality closely matched to the original factory specification. A high-pressure nitrogen gas charge and floating piston design help maintain consistent damping performance over time, resisting the fade that can result from age, heat, and heavy use. The strut self-adjusts instantaneously to changing road surfaces, providing confident handling and a comfortable ride.

Key Features:

• Bilstein B4 OE Replacement Series — engineered to match original factory ride quality
• Twin-tube gas-pressurized design for consistent, reliable damping
• Valved approximately 10% firmer than stock for slightly enhanced response
• High-pressure nitrogen gas with floating piston prevents performance decline from heat or use
• German-engineered and manufactured to world-famous Bilstein quality standards
• Limited lifetime warranty against manufacturer defects
• Not recommended for use with lowering springs

OEM Cross-Reference: This strut replaces BMW OEM part number 31 31 6 786 013 (31316786013) and is also cross-referenced as Bilstein part 22-136572.

Whether restoring a worn-out suspension or replacing a damaged strut, the Bilstein B4 OE Replacement delivers the ride comfort, safety, and durability expected from a premium German suspension brand.