2006 STI Transmission Fluid Capacity: Maintaining Your Subaru’s Performance

2006 STI Transmission Fluid Capacity

When it comes to maintaining your 2006 STI, one crucial aspect that often gets overlooked is the transmission fluid. Properly maintaining the transmission fluid can help ensure smooth gear shifts, prevent overheating, and extend the lifespan of your transmission. In this article, we will discuss the transmission fluid capacity for the 2006 STI, so you can keep your car running at its best.

Transmission Fluid Capacity and Type

Before we dive into the specifics, let’s get straight to the point. The 2006 STI transmission fluid capacity is approximately 3.9 quarts or 3.7 liters. It’s important to note that this capacity may vary slightly depending on your specific model and any modifications made to your vehicle.

Now that we know the capacity, let’s talk about the type of transmission fluid you should use. Subaru recommends using their Genuine Subaru High-Performance Transmission Fluid or an equivalent fluid that meets their specifications. It’s crucial to use the right type of fluid to ensure optimal performance and protect your transmission from unnecessary wear and tear.

Fluid Type Capacity (Quarts) Capacity (Liters)
Genuine Subaru High-Performance Transmission Fluid 3.9 3.7

How to Check and Add Transmission Fluid

Checking and adding transmission fluid to your 2006 STI is a relatively simple process. However, it’s important to exercise caution and follow the steps precisely. Here’s a step-by-step guide:

  1. Park your car on a level surface and engage the parking brake.
  2. Locate the transmission dipstick. It is usually labeled and can be found near the back of the engine compartment.
  3. Remove the dipstick and wipe it clean with a lint-free cloth or paper towel.
  4. Reinsert the dipstick fully and then remove it again to check the fluid level.
  5. Inspect the fluid on the dipstick. It should be within the “Full” or “Hot” range. If it’s below the recommended level, you’ll need to add fluid.
  6. To add fluid, use a funnel and pour it into the transmission through the dipstick tube. Be sure to add small amounts at a time and recheck the level frequently to avoid overfilling.
  7. Once the fluid level is within the recommended range, securely reinsert the dipstick.

Remember, it’s crucial to use the right type of transmission fluid and not overfill. Overfilling can lead to foaming, overheating, and potential damage to your transmission. If you’re unsure or uncomfortable performing this task yourself, it’s always best to consult a professional mechanic.


Now that you know the transmission fluid capacity for your 2006 STI, you can confidently maintain your car’s transmission. Remember to use the recommended fluid type and follow the proper steps when checking and adding fluid. By taking care of your transmission, you’ll ensure smooth gear shifts and prolong the life of your vehicle. Keep your STI running at its best, and enjoy the thrill of the road ahead!

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