Vehicle Segment:
Full-size Luxury Sedan
Key Competitors 2005:
Cadillac DTS, Lincoln Town Car, Chrysler 300M (and early 300C), Toyota Avalon, Mercury Grand Marquis
Key Features Vehicle:
Comfort-oriented ride, spacious interior, available supercharged engine, strong focus on quietness and refinement.
Key Features Manual:
Licensed OE materials, detailed diagrams, step-by-step procedures, diagnostic aids, electronic accessibility across devices.
Powertrain:
Engine (3.8L V6 Supercharged, 3.8L V6 Naturally Aspirated), Transmission (4T65-E Automatic), Drivetrain (FWD)
Chassis:
Suspension (Front & Rear), Steering, Brakes (ABS, Parking Brake)
Electrical:
Wiring Diagrams, Lighting, Power Distribution, Body Control Module (BCM), Powertrain Control Module (PCM), Infotainment System
HVAC:
Heating, Ventilation, and Air Conditioning Systems
Body:
Body Panels, Doors, Glass, Interior Trim, Exterior Trim
Maintenance:
Scheduled Maintenance, Oil Changes, Filter Replacements, Fluid Checks and Replacements, Spark Plug Replacement, Belt Inspections
Diagnostics:
Troubleshooting Guides, Diagnostic Trouble Codes (DTCs), Component Testing
Repair:
Engine Rebuild, Transmission Service, Brake Pad/Rotor Replacement, Suspension Component Replacement, Electrical Component Repair, HVAC System Repair
Special Procedures:
Supercharger Service, Tire Pressure Monitoring System (TPMS) Reset, Diagnostic Scan Tool Usage
Depth:
Factory-level detail including component removal/installation, specifications, and diagnostic strategies.
Engine Code And Description:
3800 Series III Supercharged L67 (3.8L V6 OHV) or 3800 Series III Naturally Aspirated LA3 (3.8L V6 OHV)
Horsepower Supercharged:
240 hp @ 4400 rpm
Torque Supercharged:
280 lb-ft @ 3600 rpm
Horsepower Naturally Aspirated:
205 hp @ 5200 rpm
Torque Naturally Aspirated:
230 lb-ft @ 4000 rpm
Fuel Delivery:
Sequential Port Fuel Injection (SFI)
Fuel Type:
Unleaded gasoline (87 octane recommended, 91 octane for optimal performance with supercharged)
Coolant Type:
Dex-Cool Extended Life Antifreeze/Coolant (GM specification 6277M)
Transmission Type:
4-Speed Automatic (4T65-E)
Optional Transmission:
None
Transmission Features:
Driver Shift Control (optional manual shifting), Traction Control System (TCS), StabiliTrak (on some models)
Transmission Fluid Type:
Dexron-VI Automatic Transmission Fluid (ATF) or equivalent meeting GM specification.
Transmission Fluid Capacity:
Approximately 7.5 quarts (7.1 liters) for a fluid change and filter replacement.
Length:
207.2 inches (5263 mm)
Width:
73.1 inches (1857 mm)
Height:
57.1 inches (1450 mm)
Passenger Volume:
107.5 cubic feet (3.04 m³)
Trunk Capacity:
16.1 cubic feet (0.46 m³)
Curb Weight:
Approximately 3,700 - 3,900 lbs (1678 - 1769 kg) depending on trim and options
Gross Vehicle Weight Rating Gvwr:
Approximately 4,800 - 4,900 lbs (2177 - 2223 kg)
NHTSA Front Impact Driver:
5 Stars
NHTSA Front Impact Passenger:
5 Stars
NHTSA Side Impact Front Seat:
5 Stars
NHTSA Side Impact Rear Seat:
5 Stars
IIHS Front Offset Crash Rating:
Good
Anti Lock Brakes ABS:
Standard
Traction Control System TCS:
Standard
Electronic Stability Control Esc:
StabiliTrak (Optional on some trims)
Airbags:
Frontal airbags, Side-impact airbags (optional on some trims)
Seatbelts:
3-point seatbelts with pretensioners
Infotainment System Features:
Available premium audio systems, CD player, cassette player (early models), optional navigation system.
Driver Assistance Features:
Traction Control System (TCS), optional StabiliTrak stability control.
Connectivity Features:
OnStar communication system (optional, subscription-based).
Oil Change Interval:
Every 3,000-7,500 miles (5,000-12,000 km) or 6-12 months, depending on driving conditions and oil type used (refer to owner's manual for specific recommendations).
Engine Air Filter Replacement:
Every 30,000 miles (48,000 km) or as needed based on inspection.
Cabin Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or annually, depending on environment.
Spark Plug Replacement:
3.8L naturally aspirated: ~100,000 miles (160,000 km). 3.8L supercharged: ~60,000 miles (96,000 km) with specific iridium plugs.
Engine Oil Type And Viscosity:
SAE 3.8L L36/L67: 5W-30 Synthetic or Synthetic Blend meeting GM spec GM6094M.
Engine Oil Capacity:
4.5 quarts (4.3 liters) with filter change.
Power Steering Fluid Type:
GM Power Steering Fluid (Part Number 12345877) or Dexron III/VI ATF.
Common Powertrain Issues:
Lower intake manifold gasket leaks (pre-2004 models with the 3800 Series II, less common on Series III but still possible), supercharger coupler wear, transmission solenoid issues (occasional harsh shifting).
Common Suspension Issues:
Front strut mount bearing failure (clunking noise over bumps), rear air suspension compressor failure or leaks (if equipped).
Common Electrical Issues:
Window regulator failures, BCM issues, dashboard warning lights (ABS, Service Traction System).
Buick Heritage:
Long-standing luxury division of General Motors, known for comfort, quietness, and a refined driving experience.
Park Avenue Lineage:
Successor to the Buick LeSabre, Park Avenue Ultra. Represents the flagship sedan of Buick.
Fifth Generation Styling:
Marked a significant design shift towards a more aerodynamic and contemporary look, moving away from older 'land yacht' styling.
Production Years:
1991-2005
Manufacturing Location:
GMC Detroit/Hamtramck Assembly Plant, Detroit, Michigan
