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Bmw 545I Power Steering Reservoirs

Bmw 545I Power steering reservoirs

Starting at $34.95, AutoBuffy stocks 5 power steering reservoirs from SKP, Dorman, and URO to fit the Bmw 545I. The reservoir holds and supplies hydraulic fluid to the power steering pump; when it cracks, leaks, or its internal filter clogs, fluid starves the system and steering effort increases sharply—leaving you with stiff, unpredictable handling that accelerates pump wear.

Signs your Bmw 545I needs a new power steering reservoir

  • Low or rapidly dropping power steering fluid level with no visible hose or rack leak
  • Whining or groaning noise from the pump that changes pitch when turning the wheel
  • Visible crack, hairline fracture, or oil-soaked exterior on the reservoir body itself
  • Foam or milky discoloration in the fluid, indicating air infiltration through a compromised cap seal or reservoir wall
  • Stiff or jerky steering feel, especially during slow-speed parking maneuvers
  • Fluid puddle or wet spot directly beneath the reservoir mounting bracket after the vehicle sits overnight

Which power steering reservoir should you buy for your Bmw 545I?

The main decision is whether to match the OE material and mounting configuration or upgrade to a higher-capacity unit. You also need to confirm cap thread style, return-line fitting diameter, and whether the reservoir includes an integrated filter sock, since not all aftermarket units do.

OE-equivalent replacement
Best for
Restoring factory function with a direct bolt-on fit
What you get
Matches original mounting points, cap thread, and line fittings; may or may not include cap and filter sock—verify before ordering
OEM or dealer-sourced unit
Best for
Owners who want exact material spec and no fitment guesswork
What you get
Highest confidence in sealing surface geometry and fluid compatibility; typically the most expensive option
Reservoir with integrated filter
Best for
High-mileage vehicles or those with contaminated fluid history
What you get
Built-in filter sock traps debris before it reaches the pump; simplifies service by combining two wear items into one replacement
Performance or aluminum reservoir
Best for
Modified vehicles, high-heat applications, or engine-bay builds requiring custom routing
What you get
Improved heat dissipation, higher fluid capacity, and corrosion resistance; requires confirming line size and cap compatibility

Power steering reservoirs brands we stock for your Bmw 545I

SKP
2 options · from $34.95
Dorman
1 option · from $53.95
URO
1 option · from $37.95
Vaico
1 option · from $54.95

Replacing the power steering reservoir on a Bmw 545I

Easy⏱ 45 minutes–1.5 hoursDrain pan and fluid catch ragsHose clamp pliers or flathead screwdriverSocket and ratchet setTurkey baster or fluid transfer pump (for removing old fluid)Funnel

Start by using a baster or pump to remove as much fluid from the old reservoir as possible, then loosen the hose clamps and disconnect the return and feed lines before unbolting the reservoir from its bracket. Transfer or replace the cap and filter sock as needed, mount the new reservoir, reconnect the lines, and refill with the correct fluid type. After filling, turn the wheel lock to lock several times with the engine running to bleed air from the system before checking for leaks.

Frequently asked questions

How much does it cost to replace power steering reservoirs on a Bmw 545I?
Parts start at $34.95 for the Bmw 545I at AutoBuffy. A shop will typically add one to two hours of labor on top of the part cost. Replacing the reservoir yourself is straightforward and cuts the total cost significantly, since the job generally requires only basic hand tools and a fluid flush.
Can I drive my Bmw 545I with a leaking power steering reservoir?
You can drive briefly, but it is not safe to continue once fluid drops low enough to cause pump whine or heavy steering. Running the pump dry causes rapid internal wear and can lead to a complete power steering failure. Top off the fluid and replace the reservoir as soon as possible to avoid a much costlier pump replacement.
Do I need to flush the power steering fluid when replacing the reservoir on my Bmw 545I?
Yes, a flush is strongly recommended. When a reservoir fails—especially if the internal filter sock is clogged or the fluid is contaminated—debris and degraded fluid remain in the lines and rack. Flushing the system during replacement prevents that contamination from shortening the life of your new reservoir and pump.
Does the replacement reservoir for my Bmw 545I come with the cap and filter?
It depends on the brand and part number. Some aftermarket reservoirs include the cap, dipstick, and filter sock; others ship as a bare tank. Check the product listing details on AutoBuffy before ordering—if your old cap or filter sock is worn or cracked, look for a kit that bundles them to avoid a second order.
How long does a power steering reservoir last on a Bmw 545I?
Most reservoirs last many years under normal conditions, but plastic units are vulnerable to heat cycling, UV degradation, and impact cracks. Fluid that is never changed accelerates internal filter clogging and can chemically degrade the reservoir walls. Inspecting the reservoir whenever you check fluid level helps catch small cracks before they become active leaks.
What type of power steering fluid does the Bmw 545I reservoir use?
Always use the fluid type specified in the Bmw 545I owner's manual or on the reservoir cap itself. Mixing incompatible fluid types degrades seals throughout the steering system. Common types include conventional power steering fluid, Dexron ATF, and OEM-specific formulations—never substitute without verifying the correct spec for your application.

Shop power steering reservoirs by year for the Bmw 545I

20052004

More parts for your Bmw 545I

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Power steering reservoirs for other Bmw models

Bmw 335i xDriveBmw 330iBmw 335isBmw 540iBmw 530xiBmw 328i