Smooth out a bouncy, wandering ride and keep the rear tires planted with the Monroe OESpectrum Rear Suspension Shock Absorber, MPN 5998. It installs as a direct-fit rear replacement for the 2000 BMW 323CI, 1999-2000 BMW 323I, 2001-2006 BMW 325CI, 2001-2005 BMW 325I, 2000 BMW 328CI, 2001-2006 BMW 330CI, and 2001-2005 BMW 330I — see the Buyer's Guide tab for engine details.
- Handling and control: Full displaced valving is tuned to the vehicle and works with a larger bore for more efficient damping, delivering a consistent, smooth ride.
- Reduced NVH: The Twin Technology Active Control System helps isolate impact-related noise, vibration, and harshness under most driving conditions.
- Control and durability: A PTFE-banded piston provides consistent sealing between the piston and pressure tube for better control and longer life.
- Nitrogen gas-charge: Helps maintain tire-to-road contact by reducing aeration and shock fade, while OE all-weather fluid resists breakdown across temperature extremes.
Backed by Monroe's Limited Lifetime Warranty and Feel the Difference Guarantee. Shocks work as a pair — replacing both rear units together is recommended for balanced ride control; this listing is for one.
Interchange: 33521091245 · 33521095913 · 33522282100 · 33526750781 · 33526750783 · 33526750784 · 33526757045 · 33526759100 · TS3430092B · 341522 · 69863 · 343352 · BW099 · 210150 · NS5998 · 32120182 · 785998 · 259010
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Does this shock fit the front or rear?
It is a rear suspension shock absorber. It fits the rear axle position on the listed BMW applications.
Which vehicles does the Monroe 5998 fit?
It fits the 2000 BMW 323CI, 1999-2000 323I, 2001-2006 325CI, 2001-2005 325I, 2000 328CI, 2001-2006 330CI, and 2001-2005 330I. Check the Buyer's Guide tab for engine details.
Should I replace both rear shocks at once?
Replacing both rear shocks together as a matched pair is recommended for even, balanced ride control. This listing is for one shock.
What are signs my rear shock may need replacing?
Signs a shock may need replacing include a bouncy or floating ride, poor body control over bumps, and uneven tire wear. Diagnose the cause before replacing.
Is this shock gas-charged?
Yes. It uses a nitrogen gas-charge that helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
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