BMW 525i 2.5L 2.5L Engine (2003)
VIN-VERIFIED UNIT
✓ Actual photos of the exact unit you'll receive — not a stock image
✓ Confirmed Fitment — fits these vehicles
  • 525i 2.5L 2003
Enter your VIN below and we’ll confirm the exact fit before we ship.
Engine · Tested

BMW 525i 2.5L 2.5L Engine (2003)

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Confirm it fits YOUR vehicleEnter your VIN — we verify exact fit before you pay
Find your VIN on the driver-side door jamb or lower windshield.
Unit Condition & Specs
AvailabilityIn stock — ready to ship
55% OFF $6,820.00
$3,100.00
Mileage
Learn more →
✓ Flat-rate freight — insured & tracked ·✓ 90-day warranty included· freight shown at checkout: $250 commercial / $400 residential
Ships within 3 - 5 business days Approx - flat-rate freight, tracked & insured Most orders arrive 5–7 business days after dispatch (US). You get tracking the moment it ships.
Not sure it fits? Call an expert
🛡90-Day WarrantyParts replacement
🚚Flat-Rate FreightDelivered to your door
🔒Secure CheckoutEncrypted payment
↩24-Hr Free CancelFull refund within 24h

How ordering works

  1. 1Enter or confirm your VIN
  2. 2We verify exact fitment for your vehicle
  3. 3Flat freight shown up front — no surprises
  4. 490-day warranty included on every part
  5. 5We photograph & confirm the unit before it ships
What you're getting

What's included with this engine

You're buying a complete engine assembly — not a bare block. Here's exactly what arrives bolted to it, and the handful of accessories your mechanic moves over from your current engine during the install.

✓

Included with your engine

Already assembled — ships as one unit
  • Long block — fully assembled
  • Short block
  • Cylinder head
  • Crankshaft
  • Camshaft
  • Pistons
  • Intake manifold
  • Exhaust manifold
  • Oil pan
  • Timing cover
⇄

Not included — transfer these over

Reused from your current engine
  • Wiring harness
  • Bolt-on accessories
Why these aren't included: these parts are tied to your vehicle's exact trim and options, and the ones already on your current engine are almost always in good working order. Your mechanic transfers them across during the install — that's standard practice on an engine replacement, and it keeps your price down.
Quick definition: a short block is the block, crankshaft, camshaft and pistons. A long block adds the cylinder head and valvetrain. A complete engine — what you're buying here — is the long block with the intake manifold, exhaust manifold, oil pan and timing cover already fitted.
Not sure what your install needs? Talk to a parts expert
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Part details

About this part

Restore Your BMW 525i with a 2.5L Engine 2003, RWD

Bring back the legendary smoothness of your 2003 BMW 525i (E39 chassis, RWD) with our BMW M54B25 2.5L inline-6 engine. This naturally aspirated powerplant delivers 184 HP of refined BMW performance perfect for replacing a worn engine or restoring your classic 5 Series to its original driving character.

Engine Details:

Category Specifications
Displacement 2.5L Inline-6
Engine Code M54B25
Horsepower 184 HP @ 6,000 RPM
Torque 175 lb-ft @ 3,500 RPM
Fuel System Sequential Multi-Port Fuel Injection
Valvetrain Double-VANOS (Variable Valve Timing)
Block Material Aluminum with Nickel-Silicon Coating


Compatibility:

2003 BMW 525i (E39 chassis, RWD only)
Must verify:

  • 7th VIN digit = confirms M54 engine

  • No xDrive badging or components 

  • "M54B25" casting mark on engine block

Why Choose This Engine?

Classic BMW Smoothness – 184 HP inline-6 with silky power delivery

Advanced Engineering – Double-VANOS for optimal performance at all RPMs

Lightweight & Durable – Aluminum block with wear-resistant nickel-coated cylinders

Proven Reliability – DISA intake manifold enhances torque efficiency

Pricing Options:

We price based on mileage to fit your needs:

30,000 to 60,000 Miles

Price: $1,625.00

Best value for money for moderately used engines.

60,000 to 90,000 Miles

Price: $1,267.00

Ideal for budget-conscious customers who need a good engine with slightly used mileage.

90,000 to 120,000 Miles

Price: $1,040.00

A budget-friendly choice for consumers who value the functionality and price.

120,000 to 150,000 Miles

Price: $833.30

Budget-friendly choice for restoration projects or short-term use.

Shipping information:

Weight: 320 lbs (crated)

Dimensions: 35" L × 27" W × 29" H

Shipping Options:

Standard Shipping: Available for shipping within the continental U.S.

Expedited Shipping: The shipping can be expedited for an additional charge.

Frequently Asked Questions:

Q: Does the engine come with a warranty?

A: Yes! All our engines include a 60-day warranty covering manufacturing defects.

Q: How does this differ from the 3.0L M54B30?

A: The M54B25 (2.5L) has slightly less power (184 HP vs. 215 HP) but retains the same smoothness and reliability.

Q: What if the engine doesn’t fit my car?

A: We offer a 60-day return policy if the engine is not VIN-compatible—just contact us for assistance.

Ready to Restore Your 525i?

Bring back the classic driving experience of your BMW 525i with a genuine M54B25 2.5L engine. Whether you're restoring a beloved E39 or need a reliable replacement, this engine delivers BMW’s signature performance.

Order with confidence

Tested, VIN-matched, and guaranteed

✓

VIN-Verified Fit

We match the part to your vehicle's VIN and confirm exact fitment before we ship — so it fits the first time. Free cancellation within 24 hours.

⚙

Works on Arrival, Guaranteed

Every unit is tested before it ships. If it arrives defective, we replace it fast — and in the rare case we can't replace it, you get a full refund.

★

90-Day Warranty

A real parts-replacement warranty, included — with extended coverage available.

✓Real photos of the exact unitWhat you see is what ships
✓A-grade OEM, testedVerified specs, not estimated
✓VIN-matched to your vehicleConfirmed before dispatch
Shipping & delivery

Heavy freight item, shipped fully insured and tracked. Freight is a flat $250 commercial / $400 residential, shown at checkout — no hidden fees, no freight-quote runaround.

1Ships within 3 - 5 business days ApproxCarefully packed & dispatched from our US warehouse
2Freight to your doorBrought to your door
3Delivered in 5–7 business daysTracked & insured · tracking sent when it ships
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