🏷️ Basic Information

Make:

Cadillac

Model:

STS-V

Year:

2008

Product Type:

Workshop Service Repair Manual

Chassis Code:

GMX321 (STS platform)

👋 Introduction

Positioning:

The Cadillac STS-V was Cadillac's ultra-luxury performance sedan, competing with high-performance European sport sedans. This manual serves enthusiasts and professional technicians seeking in-depth knowledge for maintaining and repairing this exclusive vehicle.

Competitors:

BMW M5, Mercedes-Benz E-Class AMG, Audi S6, Jaguar XJR. The STS-V offered a unique blend of American luxury and potent, supercharged V8 power.

Value Proposition:

Enables DIY owners to perform complex repairs and maintenance, saving significant costs associated with dealership service for a high-performance luxury vehicle. Provides the same level of detail found in official factory service manuals.

Ease Of Use:

Emphasizes 'easy to do with very easy to follow step-by-step instructions & pictures', making complex procedures more accessible.

📋 Manual Details

All Models Engines Trims Transmissions:

True

Repair Procedures Az:

True

Estimated Page Count:

Approximately 3000+ pages (typical for comprehensive workshop manuals of this era and caliber)

Type:

Complete Workshop Service Repair Manual

Language:

English

Format:

Downloadable PDF

Accessibility:

Printable, Tablet/Smartphone Compatible

Software Requirements:

Adobe Reader (Free)

Delivery Method:

Instant Email Delivery Post-Payment

📖 Manual Coverage

Engine Mechanical:

Detailed diagnosis, repair, and overhaul procedures for the 4.4L Supercharged Northstar V8 (L67/LC3 derivative), including cylinder heads, pistons, crankshaft, valvetrain, timing system, lubrication, and cooling. Includes specifications for torque, clearances, and material tolerances.

Engine Performance:

Covers fuel injection, ignition system, engine control module (ECM) operation, forced induction system (supercharger operation, intercooler system), emissions controls, and exhaust system.

Transmission:

Comprehensive repair and diagnostic procedures for the 6-speed automatic transmission (e.g., 6L80), including torque converter, valve body, electronic controls, and fluid service. Includes internal component replacement and troubleshooting.

Drivetrain:

Front-wheel drive (FWD) and all-wheel drive (AWD) system service, including driveshafts, CV joints, differential service, and related components.

Suspension:

Front and rear suspension systems, including struts, shock absorbers, control arms, ball joints, bushings, springs, and anti-roll bars. Includes alignment specifications and procedures.

Steering:

Power steering system diagnosis and repair, steering gear, steering column, and power steering fluid specifications and service.

Brakes:

Front and rear brake systems, including disc brake pad replacement, rotor resurfacing/replacement, caliper service, brake lines, hydraulic system bleeding, parking brake, and ABS/Stabilitrak system diagnostics.

Electrical System:

Complete electrical diagnostics, including battery, charging system, starter, lighting systems, power windows, door locks, mirrors, seats, and exterior/interior accessory circuits. Includes wiring diagrams and component locations.

Body Interior:

Body panel removal and installation, interior trim panel service, seat adjustment mechanisms, headliner, door panel removal, and dashboard disassembly.

Body Exterior:

Front and rear bumper assembly, fenders, hood, trunk lid, doors, glass replacement (windshield, side glass, rear glass), mirrors, and exterior trim.

HVAC:

Heating, Ventilation, and Air Conditioning (HVAC) system service, including refrigerant handling, compressor, evaporator, condenser, blower motor, and climate control module diagnostics.

Safety Restraints:

Airbag system diagnosis and replacement, seat belt service, and related SRS module components.

Routine Maintenance:

Oil changes, filter replacements (oil, air, cabin), fluid checks and top-offs, tire rotation, and general inspections.

Troubleshooting:

Diagnostic flowcharts and symptom-based troubleshooting guides for common and uncommon issues across all major vehicle systems.

Repair Overhaul:

Detailed step-by-step instructions for component removal, installation, and repair, ranging from minor adjustments to complete system overhauls.

Diagnostic Procedures:

Specific diagnostic routines for engine, transmission, ABS, SRS, climate control, and other electronically controlled systems, often referencing factory scan tool procedures.

Component Replacement:

Instructions for replacing virtually every component, including major assemblies like engines, transmissions, suspension components, and body panels.

Depth:

Comprehensive. Covers everything from basic fluid changes and inspections to advanced engine and transmission rebuilds, complex electrical diagnostics, and bodywork.

📊 Manual Specifications

File Type:

PDF

Searchability:

Likely searchable text within PDF, allowing quick navigation to specific topics.

Quality:

High Quality (implied by description 'high quality Service Repair Workshop Manual')

Binding:

N/A (Downloadable Digital Format)

Paper:

N/A (Downloadable Digital Format)

⚙️ Engine Specifications

Engine Code:

LSA (modified variant of GM's 4.4L Supercharged Northstar)

Engine Type:

4.4L DOHC 32-Valve V8, Supercharged

Bore X Stroke:

96.0 mm x 92.0 mm (approx.)

Compression Ratio:

9.1:1 (approx.)

Horsepower:

469 hp @ 6400 rpm (SAE Certified)

Torque:

439 lb-ft @ 3600 rpm (SAE Certified)

Fuel Delivery:

Sequential Port Fuel Injection (SFI), Supercharged with Intercooler

Recommended Fuel:

Premium Unleaded (91 Octane or higher)

Capacity:

Approximately 16 quarts (15.1 liters) with intercooler system

🔧 Transmission

Transmission Type:

6-speed automatic with driver shift control

Transmission Model:

6L80

Transmission Features:

Performance algorithm shifting, manual mode, paddle shifters (optional/integrated).

Transmission Fluid:

Dexron VI (or equivalent specification)

Capacity:

Approximately 9.7 quarts (9.2 liters)

📐 Dimensions

Wheelbase:

113.9 inches (2893 mm)

Length:

200.4 inches (5090 mm)

Width:

72.4 inches (1839 mm)

Height:

57.6 inches (1463 mm)

Curb Weight:

Approximately 4,363 lbs (1979 kg)

Gross Vehicle Weight Rating:

5,670 lbs (2572 kg) (approx.)

🛡️ Safety Features

NHTSA Front Crash Test:

5-Star (Driver), 4-Star (Passenger)

NHTSA Side Crash Test:

5-Star (Front & Rear)

IIHS Moderate Overlap Frontal:

Good

IIHS Side Impact:

Good

Stability Control:

Standard StabiliTrak (Vehicle Stability Enhancement System)

Traction Control:

Standard Traction Control System (TCS)

ABS:

Standard Anti-lock Braking System (ABS)

Airbags:

Frontal airbags (driver & passenger), side-impact airbags (front & rear), and side-curtain airbags (front & rear). Includes active head restraints.

💡 Technology Features

System Name:

Cadillac Navigation System with DVD Player, Bose Premium Audio System

Features:

Touchscreen interface, voice recognition, Bluetooth connectivity, climate controls integrated into infotainment.

Adaptive Cruise Control:

Available Adaptive Cruise Control (ACC) allowing the vehicle to maintain a set distance from the vehicle ahead.

Parking Assist:

Rear parking assist sensors (Ultrasonic).

Onstar:

Standard OnStar telematics system with emergency services, navigation assistance, and remote diagnostics.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles or 6 months, whichever comes first, under normal driving conditions. Severe driving may require shorter intervals. Consult manual for specific severe duty definition.

Air Filter Replacement:

Every 30,000 miles or 24 months, or as needed based on inspection. Supercharged engine may have specific recommendations due to increased air flow requirements.

Cabin Air Filter Replacement:

Every 15,000 miles or 12 months.

Transmission Fluid Change:

Under normal service, typically 'lifetime' fill is stated, but recommended inspection and potential change every 60,000 to 100,000 miles, especially for hard-driven vehicles. Consult manual for specific guidance.

Coolant Flush:

Initial change at 5 years or 100,000 miles, then every 2 years or 30,000 miles thereafter.

Engine Oil:

SAE 5W-30, meeting GM specification GM6094M. Synthetic oil recommended.

Brake Fluid:

DOT 3 or DOT 4 (check reservoir cap)

Power Steering Fluid:

GM Power Steering Fluid (or equivalent)

Supercharger Coupler:

Potential for wear or failure of the supercharger snout coupler, leading to loss of boost or noise. Requires specialized replacement.

Timing Chain Tensioners:

While improved over earlier Northstar generations, inspection for wear or noise related to timing chain tensioners is prudent for high-mileage examples.

Infotainment System:

Occasional issues with navigation system, touch screen responsiveness, or Bluetooth connectivity are not uncommon in vehicles of this era.

📚 Vehicle History

Cadillac Legacy:

Cadillac, America's preeminent luxury marque, has a long history of innovation and performance, particularly with its V8 engines. The STS-V represents a modern interpretation of Cadillac's performance aspirations.

Sts Platform:

The STS (Seville STS) platform, introduced in 2004 for the 2005 model year, was a significant evolution from its front-wheel-drive predecessors, utilizing a rear-wheel-drive architecture (with optional AWD) shared with the larger DTS. The STS-V was the high-performance variant.

Production Years:

2006-2009

Manufacturing Location:

Lansing, Michigan, USA

🏆 Awards & Recognition

Performance Awards:

While specific awards for the 2008 STS-V are not as widely documented as some competitors, it was generally recognized for its powerful V8 and significant increase in performance over standard luxury sedans of its class.

Consumer Reports Reliability:

Varied. Historically, Cadillac's Northstar engines have had mixed reliability reports. The STS-V's supercharged variant, while potent, requires diligent maintenance. Manual is crucial for addressing potential issues.