Porsche 991 S/GTS Maintenance Guide

Owning a Porsche 911 991 S or GTS is an exciting experience, offering thrilling performance and iconic design. However, to keep your 911 running at its best, regular maintenance is crucial. Following the recommended service schedule ensures your vehicle remains reliable, performs optimally, and retains its value over time. This guide provides an overview of the key service intervals and maintenance tasks for the 991 S and GTS models from 2011 to 2019.

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Service Intervals

The Porsche 911 991 S and GTS have specific service intervals based on time and distance, as outlined in the Porsche service schedule. These intervals help maintain the car’s performance and longevity.

Minor Service (Every 10,000 miles / 16,000 km or 12 months)

The minor service is a routine maintenance task that is carried out annually or every 10,000 miles (16,000 km), whichever comes first. This service includes:

• Oil Change: Replacing the engine oil and oil filter to ensure the engine runs smoothly.
• Inspection: A comprehensive inspection of the engine, transmission, and suspension components to detect any early signs of wear or potential issues.
• Tyre Check: Assessing the condition and tread depth of the tyres.
• Fluid Levels: Checking and topping up fluids such as brake fluid, coolant, and power steering fluid.
• Brake Pads and Discs: Inspecting the brake pads and discs for wear and ensuring they function correctly. Check out our range of aftermarket/performance braking products here

This service is vital for maintaining the vehicle’s engine performance and preventing minor issues from turning into major problems.

Major Service (Every 20,000 miles / 32,000 km or 24 months)

The major service is typically carried out every two years or after 20,000 miles (32,000 km). It builds upon the minor service and includes more in-depth tasks:

• Oil and Filter Change: As with the minor service, replacing the engine oil and filter.
• Air Filters: Replacing the air filters to ensure the engine receives clean air for optimal combustion. Check out the K&N Performance Replacement Air Filters for 911 S/GTS here
• Spark Plugs: Inspecting and, if necessary, replacing the spark plugs to ensure smooth engine performance.
• Cabin Filter: Replacing the cabin air filter to maintain interior air quality.
• Brake Fluid Change: Porsche recommends changing the brake fluid every two years to ensure effective braking performance, especially under high temperatures.
• Cooling System Check: Checking the cooling system, including hoses and radiators, for signs of leaks or wear.

The major service is more comprehensive and helps maintain key systems in the car, such as the braking and cooling systems, which are essential for overall reliability.

Extended Service Intervals (Every 40,000 miles / 64,000 km or 48 months)

Every 40,000 miles (64,000 km) or 48 months, more extensive service tasks are required to keep the 991 S/GTS in top condition:

• Transmission Service: Inspecting and, if needed, servicing the gearbox to ensure smooth shifting and performance.
• Porsche Doppelkupplung (PDK) Fluid Change: If your 991 is equipped with the PDK dual-clutch transmission, the gearbox fluid should be replaced at this interval to maintain optimal shifting performance.
• Differential Fluid: Changing the differential fluid to ensure the drivetrain remains smooth and efficient.
• Inspection of Suspension Components: Checking the suspension system, including shock absorbers and bushings, for signs of wear or damage.

At this interval, the focus is on more in-depth checks of the transmission and differential, which are crucial for maintaining the car's performance and driving experience.

Specific Maintenance for the GTS

While the maintenance schedule for the 991 S and GTS is largely the same, there are a few additional considerations for the GTS due to its enhanced performance features:

• Porsche Active Suspension Management (PASM): If your 991 GTS is equipped with PASM, the suspension system may need more frequent inspection. Regular checks of the suspension components, including shocks and struts, will help ensure that the system continues to perform optimally, especially if the car is driven hard or on track.
• Sport Chrono Package: The Sport Chrono package, which comes standard on the GTS, includes additional performance features like launch control and a sportier throttle response. While this doesn’t require special maintenance, keeping the system’s software up to date is important for optimal performance.

Additional Considerations for Maintaining Your 991 S/GTS

• Tire Maintenance: Given the high-performance nature of the 991, regular tyre checks are essential. Ensure the tyres are properly inflated, and check for uneven wear, which could indicate alignment or suspension issues. If you track your car or drive it hard regularly, tyre replacement intervals may come sooner than usual.
• Porsche Approved Parts: To maintain the car's performance and ensure its long-term reliability, it’s recommended to use Porsche-approved parts for replacements. These parts are designed to meet the manufacturer’s standards, ensuring compatibility and quality.
• Software Updates: The 991 models feature sophisticated electronic systems. Periodic software updates may be required to keep the car’s infotainment, diagnostic systems, and performance features running smoothly. Check with your Porsche dealership or specialist to see if updates are needed.

Conclusion

Maintaining a Porsche 911 991 S or GTS requires attention to detail and adherence to the service schedule. Regular servicing, whether minor or major, helps to keep the car running at its best and ensures reliability over the long term. By following the recommended service intervals for oil changes, inspections, and key component checks, you’ll be able to preserve the performance and value of your 991 for years to come.

As with any high-performance vehicle, it’s important to invest in proper maintenance to enjoy the driving experience that makes the Porsche 911 one of the best in the world. If in doubt, always consult a Porsche specialist or an authorised dealership to keep your 991 S or GTS in top condition.