Bilstein 36-129171 Coil Spring - Front

Bilstein B3 OE Replacement Front Coil Spring

The Bilstein B3 OE Replacement coil spring restores factory ride height, spring rate, and suspension geometry for select BMW applications. This front spring is built to OE dimensions and design type, making it a direct replacement for worn or sagging original equipment on the BMW 525i, 530i, 540i, and 528i.

Finished in black powder coat, Bilstein 36-129171 is part of the B3 OE Replacement line, which focuses on restoring original suspension function and safety to factory specifications. If you are searching for a front coil spring for a 2001-2003 BMW 525i or a 1999-2003 BMW 540i, this OE-style replacement is built for that application.

Key Features

• OE replacement front coil spring for factory-style suspension restoration
• Manufactured to OE dimensions, spring rates, and design type
• Black powder coat finish for corrosion resistance
• Bilstein B3 OE Replacement series
• Direct-fit solution for standard suspension BMW applications
• Part number 36-129171 for easy identification

Detailed Description

Bilstein 36-129171 is engineered as a front coil spring for standard suspension BMW models, including the 2001-2003 BMW 525i, 2001-2003 BMW 530i, 1999-2003 BMW 540i, and 1999-2000 BMW 528i. The spring is manufactured to match original OE dimensions and spring characteristics, helping restore the vehicle’s suspension behavior to factory specifications. This makes it a practical choice when replacing a fatigued or broken spring on a BMW 5 Series chassis.

The B3 OE Replacement line is Bilstein’s OE-style spring program, focused on preserving original ride quality and suspension geometry rather than changing the vehicle’s stance or handling balance. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Solve

• Sagging front ride height
• Broken or weakened original coil spring
• Uneven front suspension stance
• Factory ride quality loss from spring fatigue
• Suspension geometry changes caused by worn OE springs

Installation Notes and Tips

Compatible with standard suspension only. Verify the vehicle’s suspension configuration before ordering, since this spring is not listed for non-standard setups. Confirm the front position and match the part number 36-129171 to the vehicle application before installation. Professional spring compression tools and proper suspension service procedures are recommended for safe replacement.

Quality Assurance

Bilstein manufactures this B3 OE Replacement coil spring to OE dimensions, spring rates, and design types to support factory-spec suspension restoration on the listed BMW applications.