Infiniti Q45 4.5L, VIN B, 4th digit 4.5L Engine (2003-2004)
VIN-VERIFIED UNIT
✓ Actual photos of the exact unit you'll receive — not a stock image
✓ Confirmed Fitment — fits these vehicles
  • Q45 4.5L Vin B 4Th Digit 2004, 2003
Enter your VIN below and we’ll confirm the exact fit before we ship.
Used OEM Part · Tested

Infiniti Q45 4.5L, VIN B, 4th digit 4.5L Engine (2003-2004)

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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 $4,204.20
$1,911.00
Mileage
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✓ 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
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↩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
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Part details

About this part

Authentic 4.5L V8 engine block designed for 2003–2004 Infiniti Q45 applications

Restore your Infiniti Q45's ultimate luxury performance with our OEM 4.5L VK45DE engine. Designed specifically for 2003-2004 Q45 models (4th VIN digit B), this premium V8 powerplant delivers the sophisticated power and refined acceleration that defined Infiniti's flagship luxury sedan. 

Engine Specifications:

Category Details
Displacement 4.5L V8
Engine Code VK45DE (VIN B)
Horsepower 340 HP 
Torque 333 lb-ft 
Fuel System Electronic Multi-Port Fuel Injection
Valvetrain DOHC 32-Valve with CVTCS
Block Material Aluminum Block & Heads
Emissions LEV Compliant
 

Compatibility: 2003-2004 Infiniti Q45 4th VIN Digit B.

Pricing & Condition Options:

Mileage Range Price Condition
30K-60K Miles $ 1,911.00 Low mileage, excellent compression, full service records
60K-90K Miles $ 1,576.00 Well-maintained, strong performance, minimal wear
90K-120K Miles $ 1,350.00 Good condition, includes updated timing components
120K-150K Miles $ 1,195.00 Cost-effective solution for Q45 restoration
 

Key Features: 

Long Block Assembly: Fully assembled engine block featuring crankshaft, pistons, cylinder head, and complete valvetrain components.

Smooth & Reliable: We guarantee that the engine will not smoke, leak or sound. It will be a good smooth runner.

Backed by Warranty: Full warranty coverage on the complete engine assembly ensures dependable protection and confidence in your investment.

Shipping Information:

Standard shipping 5-7 business days

Expedited shipping are available for an extra cost

Frequently Asked Questions?

Q: Is this engine compatible with the Q45's 5-speed automatic transmission?

A: Yes, this engine is specifically calibrated for the Q45's 5-speed automatic transmission with manual shift mode and adaptive shift control.

Q: What improvements were made for the 2003-2004 model years?

A: OEM 4.5L V8 engine for 2003–2004 Infiniti Q45 with improved fuel injection, variable valve timing, and enhanced cooling for reliable performance.

Q: Are these becoming rare engines to find?

A: Yes, clean low-mileage examples of these final second-generation Q45 engines are becoming increasingly sought after by collectors and enthusiasts.

Ready to Order?

Select your desired mileage tier and proceed to checkout via the Add to Cart function. Our Infiniti technical team stands ready to confirm fitment specifications and provide comprehensive guidance on V8 engine installation for your 2003–2004 Q45.

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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