Bilstein 38-228599 B3 OE Rear Coil Spring 2004-2010 BMW X3 E83 Standard Susp

Vehicle Fitment

• 2004-2010 BMW X3 2.5i / 3.0i / 3.0si / xDrive28i / xDrive30i (E83) - Rear, Standard Suspension Only

Fitment Notes

• Standard Suspension (non-Sport Package) only - this spring is for E83 X3 models without the factory Sport Package or M-technology suspension specification. Vehicles equipped with Sport Package or sport-tuned suspension use a different spring rate and part number. Confirm your vehicle's suspension specification before ordering.
• Rear position, left or right - the same spring fits both sides (covers BMW OEM numbers 33 53 3 413 079 and 33 53 3 413 080). Sold individually. Order 2 for a complete rear axle replacement, which is strongly recommended when replacing due to age, sag, or failure.
• When replacing rear coil springs, it is advisable to also inspect and replace related components such as rear shock absorbers, spring pads, and strut mounts as needed.
• Black finish.

Features

• Bilstein B3 OE Replacement - manufactured to precisely match original equipment dimensions, spring rate, and coil design type for the E83 X3 rear axle. Restores factory ride height, handling balance, and suspension system safety to BMW specifications.
• Manufactured from high-quality chrome-vanadium or chrome-silicon steel with advanced heat-treatment processes for consistent spring rate, long service life, and resistance to fatigue and height loss over time.
• Hot setting after forming effectively prevents height loss - maintaining correct ride height throughout the spring's service life.
• Innovative technical design features including pigtail ends, miniblock shapes, or central force coil geometry as required for the E83 X3 application.
• Direct OE replacement - no modification required. Bolt-in fitment using factory hardware and spring seats.
• Designed to work in harmony with Bilstein B4 and B6 rear shock absorbers for a complete, balanced OE-specification suspension restoration.

Specifications

• Part Number: 38-228599
• Series: Bilstein B3 OE Replacement
• Product Type: Rear Coil Spring
• Position: Rear (Left or Right)
• Ride Height: Stock (OE replacement - no lift or drop)
• Progressive Rate: No (linear rate)
• Suspension: Standard only (non-Sport Package)
• Finish: Black
• OEM Cross References: BMW 33 53 3 413 079 / 33 53 3 413 080
• UPC: 651860714905
• Warranty: 2 Years (against defects in design, materials, and workmanship)

Included Components

• 1x Bilstein B3 OE Replacement Rear Coil Spring (38-228599)

Product Description

The Bilstein 38-228599 is a B3 OE Replacement rear coil spring for the 2004-2010 BMW X3 (E83), all trims, with standard (non-Sport Package) suspension. It directly replaces BMW OEM part numbers 33 53 3 413 079 and 33 53 3 413 080 - a single Bilstein part number covers both the left and right rear positions on this application. It is manufactured to the same dimensions, spring rate, and coil geometry as the original BMW equipment, restoring factory ride height, rear suspension balance, and handling feel.

E83 X3 rear coil springs are prone to sag and fatigue over time, particularly in higher-mileage examples - symptoms include reduced rear ride height, increased body roll, harsh or unsettled ride quality, and uneven tire wear. The Bilstein B3 uses high-quality spring steel and hot-setting after forming to prevent height loss and maintain correct spring rate throughout the part's service life. Sport Package-equipped X3 models use a different rear spring specification - confirm your suspension type before ordering. Replacement in pairs (both rear springs simultaneously) is strongly recommended. Backed by Bilstein's 2-year warranty against defects in design, materials, and workmanship.