2008 Bentley Continental GT Service Requirements & Maintenance Schedule

The 2008 Bentley Continental GT is a high-performance grand tourer powered by a twin-turbocharged 6.0L W12 engine. As this vehicle is now over 15 years old, diligent maintenance is essential to preserve its performance, reliability, and value. This guide compiles factory-recommended service requirements and known technical considerations for the 2008 model year.

Key Takeaways

• Primary Service Interval: Bentley requires scheduled maintenance every 12 months or 10,000 miles, whichever comes first . This applies to all 2008 Continental GT variants, including the W12, Speed, and GTC models.
• Engine & Performance: Powered by a 6.0L twin-turbo W12 engine producing up to 552 horsepower in standard specification, paired with a 6-speed ZF automatic transmission (ZF 6HP26) and permanent all-wheel drive .
• Engine Oil: The W12 engine requires approximately 12.5 liters for a service fill and 13.5 liters for a dry fill of high-quality synthetic oil . Change every 10,000 miles or 12 months.
• Transmission Fluid: Bentley recommends a gearbox oil change at 100,000 miles for 2004-2009 models .
• Service Structure: Bentley follows a rotating schedule of Minor, Intermediate, and Major services, with the 4th Annual (Major) service being the most comprehensive .
• Known Service Bulletins: Owners should be aware of Technical Service Bulletins covering engine misfires, brake noise, battery condition checks, and air spring fault finding .

Factory Recommended Service Schedule

Primary Service Interval

Bentley's official service schedule for the 2008 Continental GT is clear and consistent: every 12 months or 10,000 miles, whichever comes first . The vehicle is equipped with a standard service interval warning system on the instrument cluster.

Service Structure Progression

Bentley service schedules follow a pattern of alternating service types, each increasing in scope and cost as the vehicle accumulates mileage :

This pattern repeats throughout the vehicle's life .

Annual / 10,000-Mile Service Contents

At each scheduled visit, the following baseline items are typically performed:

• Engine Oil & Filter: Replaced with Bentley-specification fully synthetic oil
• Tire Rotation: All four tires rotated for even wear
• Cabin Pollen Filter: Replaced
• Windshield Wipers: Replaced as needed
• Brake System: Comprehensive inspection of brake pads and discs
• Fluid Levels: All vehicle systems checked and topped up
• Leakage Inspection: Visual inspection for fluid leaks
• Suspension: Comprehensive inspection of all components, including the air suspension system
• Battery Condition: Checked

Following the vehicle inspection, owners are informed of any components not meeting specification, at which point they can approve any necessary repairs.

20,000-Mile / 24-Month Service Additions

At the 24-month or 20,000-mile mark, additional items are recommended :

• Brake Fluid: Replaced
• Engine Air Filter: Replaced
• Pollen Filter: Replaced (if not done at annual service)
• Spark Plugs: Inspected
• Exhaust System: Inspected for leaks or damage
• Steering Gear, Linkage, and Suspension: Inspected

30,000, 60,000, and 90,000-Mile Services

At these milestones, more comprehensive maintenance is performed, including :

• Fuel service
• Drive belt tension adjustment
• Cooling system flush
• Computerized diagnostic service

Engine Oil Change Guidance

Oil Specifications

The 2008 Continental GT's W12 engine requires precise lubrication with high-quality synthetic oil :

Oil Change Interval

• Factory recommendation: Every 12 months or 10,000 miles .
• Conservative owner guidance: Never exceed 12 months for an oil change, even if the mileage is low. Synthetic oil can degrade over time. For vehicles used primarily in extreme climates or short-trip city driving, many specialists recommend more frequent changes.

Owner accounts suggest that even with regular oil changes at 6,500 km (approximately 4,000 miles), the oil can appear dark, which is normal for this high-performance engine .

Transmission Service Guidance

Transmission Specifications

The 2008 Continental GT is equipped with a 6-speed ZF automatic transmission (ZF 6HP26) . The vehicle features permanent all-wheel drive .

Service Interval

Bentley recommends a gearbox oil change at 100,000 miles for 2004-2009 models . The gearbox oil strainer kit (part number 09E325429K-2) is recommended for this service and is suitable for all 2004-2011 Continental GT, GTC, and Flying Spur models with the 6-speed ZF gearbox .

Warning Signs

If shifting becomes rough, delayed, or is accompanied by unusual noises or lurching, have the transmission inspected immediately by a Bentley service center.

Spark Plug Timing

Replacement Interval

Spark plugs are a significant service item on the Continental GT. The W12 engine requires 12 spark plugs. Replacement is typically included in the 4th Annual (Major) service at 40,000 miles .

Given the high-performance nature of the Continental GT's W12 engine, adherence to the factory-recommended replacement schedule is essential for maintaining optimal ignition performance, fuel efficiency, and engine health.

Brake Fluid Recommendations

Fluid Specifications and Service Interval

The 2008 Continental GT uses DOT-4 brake fluid.

• Inspection: Brake fluid level and condition should be inspected at every scheduled service.
• Replacement: A conservative approach is to flush and replace brake fluid every 2 years or at the 20,000-mile service, as brake fluid is hygroscopic and absorbs moisture over time, degrading braking performance .

Coolant Service Timing

Replacement Interval

The cooling system is checked at every annual service for condition and proper protection levels. Coolant replacement is typically included in the Major service at 40,000 miles or recommended at 5-7 years .

Known Technical Service Bulletins (TSBs)

Several Technical Service Bulletins have been documented for the 2008 Bentley Continental GT, highlighting areas requiring attention during service:

High-Mileage Maintenance Planning

For 2008 Continental GT examples approaching or exceeding 100,000 miles, the following items should be considered:

1. Major Service: If not recently performed, the Major service includes spark plug replacement and coolant flush.
2. Transmission Fluid Service: At 100,000 miles, Bentley recommends a gearbox oil change, including the oil strainer kit .
3. Brake System Overhaul: Brake pads and discs should be inspected regularly and replaced as needed.
4. Air Suspension Inspection: The Continental GT features advanced air suspension; this system should be professionally inspected as part of the regular service schedule.
5. Cooling System: Inspect radiator and cooling system components for corrosion or damage.

Long-Term Ownership Considerations

The 2008 Bentley Continental GT rewards diligent and proactive maintenance. Key considerations for owners include:

• Service Documentation: Maintaining a comprehensive service history is critical for preserving the vehicle's resale value. A leather-bound Bentley service book and regular service stamps are highly valued .
• Specialist Care: Given the vehicle's complexity, service should be performed by certified Bentley technicians or independent specialists with the right equipment and genuine parts. A well-documented example shows the benefit of servicing by specialist independent garages .
• Battery Maintenance: The Continental GT's advanced electrical systems require proper battery maintenance; a trickle charger is recommended for vehicles not used regularly.
• Tire Maintenance: With its power and all-wheel-drive configuration, proper tire pressure and condition are essential for safety and performance.