2008 Subaru Impreza Transmission Fluid Type Guide

Understanding Transmission Fluid for Your Subaru Impreza

When it comes to maintaining your 2008 Subaru Impreza, one of the most crucial aspects is ensuring you use the correct transmission fluid. Using the right fluid not only keeps your transmission running smoothly but also prolongs its lifespan. So, what should you be using? Let’s break it down.

Manufacturer Recommendations

Subaru has specific recommendations for the type of transmission fluid that should be used in the 2008 Impreza. According to Subaru’s official guidelines, the recommended transmission fluid is:

– Subaru CVT Fluid: This is a specialized fluid designed for continuously variable transmissions (CVT). It is formulated to provide optimal performance and protection for the transmission system.

Specifications of Subaru CVT Fluid

The Subaru CVT fluid meets specific criteria that make it suitable for your Impreza’s transmission. Here are the key specifications:

• Viscosity: The fluid must have a viscosity that allows for smooth operation across a range of temperatures.


• Friction Characteristics: It should have the right friction properties to prevent slipping and ensure proper engagement of the transmission.


• Thermal Stability: The fluid must be able to withstand high temperatures without breaking down, which is crucial for maintaining performance.


• Oxidation Resistance: It should resist oxidation to prevent sludge buildup, which can lead to transmission failure.

Why Use the Recommended Fluid?

Using the manufacturer-recommended fluid is not just a suggestion; it’s essential for several reasons:

1. Performance: Subaru CVT fluid is engineered specifically for the unique requirements of your Impreza’s transmission. Using anything else can lead to poor performance.


2. Warranty Protection: If your vehicle is still under warranty, using the recommended fluid is crucial for maintaining warranty coverage. Using an incompatible fluid can void your warranty.


3. Longevity: The right fluid helps to reduce wear and tear on the transmission components, extending the life of your vehicle.


4. Efficiency: Proper fluid ensures that your transmission operates efficiently, which can improve fuel economy.

Where to Find the Right Fluid

You can find Subaru CVT fluid at various locations:

• Authorized Subaru dealerships


• Reputable auto parts stores


• Online retailers specializing in automotive fluids

Make sure to check the packaging to confirm that it meets Subaru’s specifications.

In summary, using the correct transmission fluid for your 2008 Subaru Impreza is non-negotiable. Stick to Subaru CVT fluid to ensure your transmission operates as it should, providing you with the reliability and performance you expect from your vehicle.

Recommended Oil Brands for Your Subaru Impreza

When it comes to maintaining your 2008 Subaru Impreza, choosing the right transmission fluid is crucial. While Subaru recommends their own CVT fluid, many owners have shared their experiences with various brands that meet or exceed the manufacturer’s specifications. Let’s dive into some of the most recommended oil brands based on owner feedback and discussions from automotive forums.

Subaru Genuine CVT Fluid

It’s no surprise that the first recommendation is Subaru’s own Genuine CVT Fluid. Many owners swear by it for a variety of reasons:

• Designed specifically for Subaru vehicles, ensuring compatibility and optimal performance.


• Consistent positive feedback regarding smooth shifting and overall transmission performance.


• Widely available at Subaru dealerships and authorized retailers.

Mobil 1 Synthetic CVT Fluid

Another popular choice among Subaru Impreza owners is Mobil 1 Synthetic CVT Fluid. Here’s why it’s often recommended:

• High-quality synthetic formulation that provides excellent protection against wear and tear.


• Owners report improved shifting performance and responsiveness compared to other brands.


• Good thermal stability, which is essential for maintaining fluid performance in varying temperatures.

Valvoline CVT Fluid

Valvoline has made a name for itself in the automotive fluid market, and their CVT fluid is no exception. Here’s what owners have to say:

• Affordable option without compromising on quality.


• Positive reviews regarding its ability to reduce noise and improve shifting smoothness.


• Widely available at most auto parts stores, making it easy to find.

Castrol Transmax CVT Fluid

Castrol is another well-known brand that many Subaru owners have turned to. Here are some highlights:

• Formulated to provide excellent friction performance, which is crucial for CVTs.


• Users have reported a noticeable improvement in transmission responsiveness after switching to Castrol.


• Good thermal and oxidation stability, ensuring longevity of the fluid.

Amsoil Synthetic CVT Fluid

Amsoil is often regarded as a premium brand in the automotive fluid industry. Here’s what Subaru owners think:

• High-performance synthetic fluid that offers superior protection and performance.


• Many users report extended intervals between changes due to the fluid’s durability.


• While it may be pricier than other options, many owners feel it’s worth the investment for long-term reliability.

Owner Experiences and Feedback

The automotive community is a treasure trove of information, and many Subaru owners share their experiences on forums and social media. Here are some common themes:

1. Many owners emphasize the importance of sticking to fluids that meet Subaru’s specifications to avoid potential issues.


2. Several users have reported that switching to a high-quality synthetic fluid has improved their vehicle’s performance, especially in terms of shifting.


3. Cost is a significant factor for many owners, leading them to explore various brands while still prioritizing quality.

In summary, while Subaru Genuine CVT Fluid is the go-to recommendation, brands like Mobil 1, Valvoline, Castrol, and Amsoil have garnered positive feedback from the Subaru community. Always ensure that the fluid you choose meets the necessary specifications to keep your 2008 Subaru Impreza running smoothly.

Change Interval for Your Subaru Impreza Transmission Fluid

Maintaining your 2008 Subaru Impreza involves more than just regular oil changes; the transmission fluid also requires attention. Understanding the change interval for your transmission fluid is critical for ensuring the longevity and performance of your vehicle.

Recommended Change Interval

For the 2008 Subaru Impreza, the general recommendation for changing the CVT fluid is every 30,000 to 60,000 miles (approximately 48,000 to 96,000 kilometers). However, this can vary based on driving conditions and habits. Here are some factors to consider:

• Driving Conditions: Frequent stop-and-go driving, towing, or driving in extreme temperatures can necessitate more frequent changes.


• Owner’s Manual: Always refer to your owner’s manual for the manufacturer’s specific recommendations, as they may provide guidelines tailored to your vehicle.


• Fluid Condition: Regularly checking the condition of your transmission fluid can help determine if a change is needed sooner than the recommended interval.

Partial Transmission Oil Changes

In many cases, a complete transmission fluid change can only be performed by removing the transmission from the vehicle, which is a labor-intensive and costly process. This is where partial transmission oil changes come into play.

What is a Partial Transmission Oil Change?

A partial transmission oil change involves draining a portion of the old fluid and replacing it with new fluid. This method is often more practical and cost-effective for vehicle owners. Here are some key points:

• Typically, only about 30% to 50% of the fluid can be replaced during a partial change.


• This method helps to refresh the fluid without the need for extensive labor.


• It can be done more frequently, allowing for better maintenance of the transmission system.

Justification for Partial Changes

Statistical data and expert opinions support the practice of partial transmission fluid changes. According to various automotive maintenance studies, regular fluid changes—whether partial or full—can significantly reduce the risk of transmission failure. Here are some insights:

1. Fluid Degradation: Transmission fluid degrades over time due to heat and contamination. Partial changes help to mitigate this degradation by introducing fresh fluid.


2. Cost-Effectiveness: A full fluid change can be expensive, often requiring specialized equipment and labor. Partial changes provide a budget-friendly alternative.


3. Improved Performance: Many mechanics and automotive experts agree that even partial changes can improve shifting performance and overall transmission health.

In summary, while the recommended change interval for your Subaru Impreza’s transmission fluid is generally every 30,000 to 60,000 miles, considering partial transmission oil changes can be a practical approach to maintaining your vehicle’s performance without the need for a complete fluid removal. Regular maintenance, whether partial or full, is key to ensuring the longevity of your transmission system.

What Color Should Transmission Fluid Be?