🏷️ Basic Information

Make:

Kia

Model:

Optima

Year:

2008

Engine:

2.4L

Internal Chassis Code:

MG

👋 Introduction

Market Position:

The 2008 Kia Optima was positioned as a competitive mid-size sedan, aiming to offer value, reliability, and stylish design in a segment dominated by established Japanese and American brands. It targeted consumers seeking a practical and well-equipped vehicle for daily use and family transport.

Competitive Analysis:

Competed directly with vehicles such as the Toyota Camry, Honda Accord, Ford Fusion, Chevrolet Malibu, and Hyundai Sonata. The 2008 Optima, particularly with the 2.4L engine, offered a blend of fuel efficiency and adequate power for its class, often at a more accessible price point.

Key Features:

Spacious interior, comfortable ride, improved safety features compared to previous generations, availability of modern amenities, and a strong warranty backing (though this manual is for repair, not warranty). The 2.4L engine provided a balance of performance and economy.

📋 Manual Details

Coverage Areas:

Engine, Transmission, Drivetrain, Brakes, Steering, Suspension, HVAC, Electrical Systems, Body & Chassis, Diagnostics, Maintenance, Troubleshooting, Wiring Diagrams

Page Count:

Approximately 1500-2500 (typical for comprehensive service manuals, exact count not provided in product description)

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Powertrain:

Engine mechanical (including disassembly, assembly, specifications), Fuel System, Ignition System, Exhaust System, Cooling System, Lubrication System, Engine Control System (ECM), Turbocharger (if applicable), Manual Transmission, Automatic Transmission (including torque converter, valve body, solenoids)

Drivetrain:

Front Wheel Drive (FWD) system, Axles, CV joints, Differential

Chassis:

Braking System (ABS, EBD, hydraulic components, parking brake), Steering System (power steering, steering column, tie rods), Suspension System (front and rear suspension components, shock absorbers, springs, control arms)

Electrical:

Battery, Charging System (alternator), Starting System (starter motor), Lighting System (headlights, taillights, interior lights), Instrumentation, Gauges, Wiper & Washer System, Horn, Audio System, Power Accessories (windows, locks, mirrors), Body Control Module (BCM), Powertrain Control Module (PCM), SRS (Airbag) System, Immobilizer System

HVAC:

Air Conditioning (compressor, condenser, evaporator, refrigerant), Heating System, Ventilation System, Climate Control Module

Body And Chassis:

Body Panels, Doors, Hood, Trunk, Bumpers, Glass, Seats, Interior Trim, Frame & Unibody Structure

Maintenance:

Oil Changes, Filter Replacements (oil, air, fuel, cabin), Spark Plug Replacement, Coolant Flush & Refill, Brake Fluid Flush, Transmission Fluid Change, Belt Inspections & Replacements, Battery Testing & Maintenance, Tire Rotation & Pressure Checks, Wiper Blade Replacement, Lamp Bulb Replacement

Troubleshooting:

Diagnostic Trouble Codes (DTCs) interpretation, Common symptoms and their causes, Step-by-step diagnostic procedures for various systems, Electrical circuit diagnosis, Mechanical component testing

Repair:

Engine component replacement (pistons, rings, valves, bearings), Cylinder head repair, Transmission overhaul, Brake caliper & rotor replacement, Suspension arm & bushing replacement, Power steering pump replacement, HVAC component repair, Electrical component diagnosis & replacement, Body panel repair & replacement, SRS system component replacement

Diagnostics:

Scan Tool Usage, Data Stream Analysis, Component Actuation Tests, Live Sensor Data Interpretation, Circuit Testing (voltage, resistance, continuity)

Technical Depth:

Comprehensive. Covers everything from routine maintenance to complete engine and transmission overhauls, including detailed diagnostic procedures, wiring diagrams, and torque specifications. Suitable for professional technicians and advanced DIY enthusiasts.

📊 Manual Specifications

File Format:

PDF

Searchable Text:

Typically yes, for professionally generated PDF service manuals.

Printable:

Yes, PDF format allows for printing of individual pages or sections.

Print Quality:

High resolution for clear text and diagrams (inherent to digital PDF format).

Binding Type:

Not applicable (Digital PDF format)

Paper Type:

Not applicable (Digital PDF format)

⚙️ Engine Specifications

Engine Code:

G4KC (Theta)

Engine Type:

Inline 4-cylinder, DOHC, 16-valve

Displacement:

2359 cc (2.4 Liters)

Bore X Stroke:

87.0 mm x 97.0 mm

Compression Ratio:

9.5:1

Horsepower:

175 hp @ 6000 rpm (approximate, can vary slightly by market and configuration)

Torque:

169 lb-ft @ 4000 rpm (approximate, can vary slightly by market and configuration)

Fuel Induction:

Electronic Multi-Port Fuel Injection (MPI)

Fuel Type:

Unleaded Gasoline (87 octane recommended)

Engine Control Module:

Kia ECM, specific part number varies by VIN

🔧 Transmission

Transmission Type:

5-speed Automatic Transmission

Transmission Type Optional:

5-speed Manual Transmission (less common on 2.4L models in some markets)

Automatic Features:

Electronically controlled, Lock-up torque converter

Automatic Transmission Fluid:

Kia SPIII (or equivalent DEXRON-III/MERCON compatible fluid, consult manual for precise specification)

Automatic Transmission Fluid Capacity:

Approximately 7.2 quarts (6.8 liters) for a complete fill, subject to specific procedure.

📐 Dimensions

Length:

187.8 inches (4770 mm)

Width:

70.1 inches (1780 mm)

Height:

57.5 inches (1460 mm)

Wheelbase:

107.1 inches (2720 mm)

Passenger Volume:

Approximately 102.4 cubic feet

Trunk Volume:

Approximately 15.9 cubic feet

Curb Weight:

Approximately 3200-3400 lbs (1450-1542 kg), depending on trim and options

Standard Tire Size:

205/60R16

Optional Tire Size:

215/50R17, 225/45R18 (depending on trim)

Wheel Bolt Pattern:

5x114.3 mm (5x4.5 inches)

Wheel Size:

16, 17, or 18 inches

🛡️ Safety Features

NHTSA Front Impact Rating:

5-Star (driver and passenger)

NHTSA Side Impact Rating:

5-Star (front and rear passengers)

IIHS Top Safety Pick:

Yes (for models equipped with specific safety features)

Active Features:

Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist (BA)

Passive Features:

Front Dual-Stage Airbags, Front Side-Impact Airbags, Side Curtain Airbags (front and rear), Active Head Restraints, Pretensioners and Load Limiters for front seat belts, Crumple Zones

💡 Technology Features

Infotainment Features:

Standard AM/FM/CD audio system with auxiliary input. Optional premium audio systems, satellite radio capability, and in-dash CD changer were available on higher trims.

Driver Assistance Features:

Basic driver assistance features included ABS, EBD, and Brake Assist. Advanced features like Electronic Stability Control (ESC) or traction control were optional on some trims.

Connectivity Options:

Auxiliary audio input jack for portable music players. Bluetooth connectivity for hands-free calling was an option on select trims.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles or 6 months, whichever comes first (using synthetic oil, consult owner's manual for specific type).

Engine Air Filter Replacement:

Inspect every 7,500 miles, replace as needed or at least every 30,000 miles.

Cabin Air Filter Replacement:

Inspect every 7,500 miles, replace as needed or at least every 15,000 miles.

Spark Plug Replacement:

100,000 miles (if Iridium type)

Timing Belt Replacement:

This engine uses a timing chain, not a belt, so no replacement interval for a timing belt is needed.

Coolant Replacement:

Initial replacement at 100,000 miles, then every 50,000 miles thereafter.

Engine Oil Specification:

API SM or higher, SAE 5W-20 synthetic recommended for optimal performance and fuel economy.

Engine Oil Capacity:

4.5 US quarts (4.3 liters) with filter change

Coolant Type:

HOAT (Hybrid Organic Acid Technology) coolant, typically P-HOAT type in a 50/50 mix with distilled water. Kia part number: 00219-9002A (Blue coolant).

Brake Fluid Type:

DOT 3 or DOT 4

Known Issues:

Some reports of premature wear in the front suspension components (control arm bushings, ball joints), occasional issues with power window regulators, and potential for oil consumption in higher mileage engines. The 2.4L engine is generally considered reliable, but proper maintenance as outlined in this manual is crucial.

📚 Vehicle History

Brand Heritage:

Kia Motors Corporation, a South Korean automotive manufacturer, has a history dating back to 1944. It has grown significantly to become one of the world's largest automakers, known for its value, design, and improving reliability. Kia is part of the Hyundai Motor Group.

Model Evolution:

The 2008 Optima is part of the second generation (MS platform) of the Kia Optima, which debuted for the 2006 model year. This generation saw a significant redesign, improving styling, interior quality, and performance over its predecessor. The 2.4L engine was a popular choice, offering a good balance of power and efficiency.

Production Location:

Hwasung, South Korea

Production Years For Second Gen:

2006-2010

🏆 Awards & Recognition

Recognitions:

While specific awards for the 2008 model year are less prominent, Kia as a brand received recognition for improved reliability and value from publications like J.D. Power and Consumer Reports around this period, indicating a positive trend for the Optima.

Jd Power Dependability Rating:

The Optima generally scored average to above-average in initial quality and dependability studies for its segment during this generation, reflecting Kia's commitment to improving product quality.