The Mazda MAZDASPEED6, a turbocharged, all-wheel-drive sedan, offered a compelling blend of performance and practicality that resonated with enthusiasts. However, like any performance car, certain model years are more desirable than others due to reliability and design improvements. This guide will delve into the best and worst years of the MAZDASPEED6, providing you with the information needed to make an informed decision.
MAZDASPEED6 Model Year Comparison
| Feature/Issue | 2006-2007 | 2007.5-2008 |
|---|---|---|
| HPFP Issues | High-Pressure Fuel Pump (HPFP) failure is a common issue. Early models are particularly susceptible. Symptoms include hesitation under acceleration, rough idling, and potential engine damage if left unaddressed. An upgraded HPFP is highly recommended to mitigate this risk. | Partially addressed HPFP issues. Mazda revised the HPFP design mid-2007, but the problem wasn't entirely eliminated. An upgraded HPFP is still recommended but the risk is slightly lower compared to the earlier models. Some owners report fewer issues. |
| VTCS/DISI Valve Failure | Variable Tumble Control System (VTCS) and Direct Injection Spark Ignition (DISI) valve failures are prevalent. Broken butterfly valves can be ingested into the engine, causing severe damage. A VTCS delete is a common solution, though it might affect low-end torque slightly. | VTCS/DISI valve failures still present. Although no official changes were made, some speculate that later models might have slightly improved components. However, the risk of failure remains significant, and a VTCS delete is still a recommended preventative measure. |
| Turbocharger Issues | Turbocharger failure, particularly oil starvation, is a concern. Regular oil changes with high-quality synthetic oil are crucial. Checking the banjo bolt screen (oil feed line to the turbo) for clogs is also recommended. The stock turbo is relatively small and can be easily overstressed. | Similar turbocharger issues. The same oil starvation and turbo failure risks apply to later models. Maintaining proper oil levels and using high-quality oil are essential for preventing premature turbo failure. |
| Transmission Issues | Manual transmission issues, including grinding gears and difficulty shifting, can occur. This is often due to worn synchros or a failing clutch. Replacing the transmission fluid regularly with a high-quality fluid is recommended. Some owners opt for aftermarket short shifters. | Transmission issues persist. No significant changes were made to the transmission. The same maintenance and potential issues apply to the 2007.5-2008 models. |
| Rust | Rust, especially in colder climates, is a known issue, particularly around the rear wheel wells and undercarriage. Regular washing and waxing, along with rustproofing treatments, are essential for preventing rust. | Similar rust susceptibility. The same rust prevention measures are necessary for later models. |
| Fuel Economy | Relatively poor fuel economy compared to other sedans in its class. This is due to the turbocharged engine and all-wheel-drive system. Expect around 18-20 MPG in the city and 24-26 MPG on the highway. | Similar fuel economy. No significant changes were made that would impact fuel economy. |
| Software Updates | ECU tuning improvements were made in later model years. These updates addressed some drivability issues and improved performance. | Improved ECU tuning. The 2007.5-2008 models generally have better ECU tuning from the factory, resulting in smoother throttle response and slightly improved performance. |
| Availability of Parts | Parts availability can be a challenge for some components, especially those specific to the MAZDASPEED6. This can make repairs more difficult and expensive. | Similar parts availability challenges. Finding MAZDASPEED6-specific parts can still be an issue. |
| Overall Recommendation | Potentially rewarding with diligent maintenance and preventative upgrades. Requires more proactive care and attention to potential issues. Budget for an upgraded HPFP, VTCS delete, and regular maintenance. | Slightly more desirable due to improved ECU tuning, but still requires proactive maintenance. The upgraded ECU tuning offers a slight advantage, but the same preventative measures are still necessary. |
Detailed Explanations
HPFP Issues: The High-Pressure Fuel Pump (HPFP) is a critical component responsible for delivering fuel at the high pressure required by the direct injection system. The original HPFP design in the early MAZDASPEED6 models was prone to failure, often resulting in fuel starvation, especially under heavy acceleration. This can lead to hesitation, rough idling, and, in severe cases, engine damage. Upgrading to a more robust aftermarket HPFP is a highly recommended preventative measure.
VTCS/DISI Valve Failure: The Variable Tumble Control System (VTCS) and Direct Injection Spark Ignition (DISI) valve systems are designed to optimize airflow and combustion efficiency. However, the butterfly valves within these systems are known to break apart and be ingested into the engine, causing significant damage. A VTCS delete involves removing these valves altogether, eliminating the risk of failure. While this might slightly reduce low-end torque, it's a worthwhile trade-off for improved engine reliability.
Turbocharger Issues: The turbocharger is responsible for forcing more air into the engine, boosting power output. The MAZDASPEED6's turbocharger is susceptible to oil starvation, primarily due to a small screen filter in the banjo bolt that feeds oil to the turbo. This screen can become clogged with debris, restricting oil flow and leading to premature turbo failure. Regular oil changes with high-quality synthetic oil and periodically checking the banjo bolt screen are essential for preventing this issue.
Transmission Issues: The manual transmission in the MAZDASPEED6 can experience grinding gears and difficulty shifting, particularly into second and third gear. This is often due to worn synchros, which are responsible for synchronizing the speeds of the gears during shifting. Replacing the transmission fluid regularly with a high-quality fluid can help prolong the life of the transmission. Some owners also opt for aftermarket short shifters, which can improve shift feel and reduce shift throws.
Rust: Rust is a common issue for MAZDASPEED6 models, especially in regions with harsh winters and road salt. The rear wheel wells and undercarriage are particularly susceptible to rust. Regular washing and waxing, along with rustproofing treatments like undercoating, are crucial for preventing rust and preserving the car's structural integrity.
Fuel Economy: Due to its turbocharged engine and all-wheel-drive system, the MAZDASPEED6's fuel economy is relatively poor compared to other sedans in its class. Expect to average around 18-20 MPG in the city and 24-26 MPG on the highway. Driving habits and modifications can further affect fuel economy.
Software Updates: Mazda released ECU (Engine Control Unit) software updates for the MAZDASPEED6 throughout its production run. These updates addressed some drivability issues, such as throttle response and idle stability, and improved overall engine performance. Later model years generally have the most up-to-date software from the factory.
Availability of Parts: Finding specific parts for the MAZDASPEED6 can sometimes be a challenge, especially for components that are unique to this model. This can make repairs more difficult and expensive. Online forums and specialized Mazda parts suppliers are often the best resources for finding hard-to-find parts.
Overall Recommendation: The MAZDASPEED6 can be a rewarding car to own, but it requires diligent maintenance and preventative upgrades to ensure reliability. Budgeting for an upgraded HPFP, VTCS delete, and regular maintenance is essential. Later model years (2007.5-2008) are generally considered slightly more desirable due to improved ECU tuning, but the same preventative measures are still necessary.
Frequently Asked Questions
Which year MAZDASPEED6 is the most reliable? The 2007.5-2008 models are generally considered slightly more reliable due to improved ECU tuning, but all years require proactive maintenance.
What is the most common problem with the MAZDASPEED6? The most common problem is HPFP failure, which can lead to fuel starvation and engine damage.
Is the MAZDASPEED6 expensive to maintain? Yes, the MAZDASPEED6 can be expensive to maintain due to the potential for turbocharger and transmission issues, as well as the need for preventative upgrades.
Should I buy a MAZDASPEED6 with high mileage? It depends on the car's maintenance history. A well-maintained high-mileage example may be a better choice than a neglected low-mileage one.
What is a VTCS delete? A VTCS delete is the removal of the Variable Tumble Control System valves to prevent them from breaking and causing engine damage.
Conclusion
The Mazda MAZDASPEED6 offers a thrilling driving experience, but careful consideration should be given to potential issues. While the 2007.5-2008 models offer some improvements, all years benefit from proactive maintenance and upgrades. Thorough research and a pre-purchase inspection are crucial for making an informed decision.