How much transmission fluid does a 2015 Mustang hold?

The amount depends on which transmission your Mustang has. An automatic 6R80 requires about 12 quarts of fluid in total (including the torque converter), while a manual Tremec TR6060 uses roughly 2.0–2.3 quarts of gear oil. Always confirm with your owner’s manual or a Ford service manual for the exact specification.

Overview of 2015 Mustang Transmissions

For the 2015 model year, Ford offered two main transmission setups for the Mustang: an automatic six-speed (the 6R80) and a manual six-speed (the Tremec TR6060). Fluid capacities vary between these transmissions, and service procedures differ accordingly. Below are the general figures you’ll encounter when planning a fluid change or a full drain-and-fill.

Automatic transmission (6R80)

Key capacity figures for the 6R80, the common automatic option on the 2015 Mustang, are:

• Total transmission fluid capacity (including the torque converter): about 12 quarts (roughly 11–12 liters).


• Transmission pan capacity: typically around 8–9 quarts.


• Drain-and-fill versus full system replacement: a pan drain-and-fill usually uses about 5–6 quarts of fluid, while a full system replacement or flush can approach the total capacity.

When servicing the 6R80, Ford commonly specifies Dexron VI automatic transmission fluid. For a pan drop-and-fill, plan to replace several quarts, and for a complete fluid replacement, you’ll work toward the full roughly 12-quart capacity. Use the proper torque specifications and follow the service manual to ensure the fluid level is correct after servicing.

Manual transmission (Tremec TR6060)

Key figures for the manual Tremec TR6060 are:

• Approximate capacity: about 2.0–2.3 quarts (roughly 1.9–2.2 liters) of gear oil.


• Recommended fluid type: Tremec-specified gear oil (typically 75W-90 GL-4/GL-5 compatible), not automatic transmission fluid.


• Fill procedure note: fill to the level specified by Tremec/Ford, using the proper fill plug and ensuring the level is correct after the vehicle sits and the oil settles.

Always use the oil type and viscosity recommended for the TR6060 by Tremec or Ford, and verify exact specifications in the owner’s manual or service documents. Manual transmissions rely on gear oil rather than ATF, so using the wrong fluid can compromise shifting and longevity.

Practical guidance for owners

Before attempting any transmission fluid work, identify which transmission your car has and consult the official documentation. The capacities above are typical ranges and can vary slightly by production lot or trim. If you’re performing a service at home, gather the correct fluid type, have a drain pan ready, and follow proper safety procedures for lifting and supporting the vehicle.

The most reliable path to exact figures is to check the owner’s manual, Ford’s service information, or a trusted service manual for the 2015 Mustang. If you’re unsure which transmission you have, a quick VIN-based lookup or a look under the transmission pan (without removing the transmission) can confirm the correct specification.

Summary

In short, the 2015 Mustang holds about 12 quarts of fluid in the automatic 6R80 transmission and roughly 2.0–2.3 quarts in the manual Tremec TR6060. Fluid type matters immensely: Dexron VI for the automatic and gear oil (as specified by Tremec/Ford) for the manual. Always verify exact capacities and specifications with the vehicle’s documentation or a qualified technician.

How to check 2015 Mustang transmission fluid?

Turn on the engine and allow it to warm up for a few minutes. Make sure your car is in park before getting out and opening the hood. Locate the transmission fluid dipstick, usually located to the right of the oil dipstick on older Ford Mustang models, but may vary based on model year.

How many quarts does a 2015 Ford Mustang take?

8 quarts
8 quarts (with filter). After refill check oil level.

How much fluid does a 6R140 transmission hold?

The Ford 6R140 transmission has a total capacity of about 16.2 to 17.4 quarts for a full rebuild, but an initial fill after a filter change is typically around 8 to 10 quarts. When changing the fluid, you will need to add a specific amount based on whether you are just changing the filter or doing a complete fluid flush.
 
This video demonstrates how to change the transmission fluid in a Ford 6R140: 42sFordTechMakulocoYouTube · Apr 17, 2017
Fluid capacity breakdown

• Initial fill (with filter change): Approximately 8.28.28.2 quarts. Some sources say up to 101010 quarts. 
• Total fill (full rebuild): Approximately 16.216.216.2 to 17.417.417.4 quarts. 
• Service kit (filter, pan gasket, and fluid): Kits often come with 101010 quarts of fluid, which is usually the amount needed for a standard service. 

Important considerations

• Fluid type: The 6R140 transmission requires MERCON LV Automatic Transmission Fluid (ATF). 
• Service vs. rebuild: The difference in capacity is because a simple service only replaces the fluid in the pan, while a complete rebuild also includes the fluid in the torque converter and cooler lines. 
• Deep transmission pans: Aftermarket deep pans can significantly increase fluid capacity, with some adding as much as 777 quarts to the stock pan. 
• Transfer case: The transfer case on many vehicles with the 6R140 transmission holds approximately 222 quarts of the same fluid. 

You can watch this video to see what a Ford 6.7L Powerstroke 6R140 transmission looks like: 40sMed Tec67YouTube · Jan 31, 2021

How many quarts of transmission fluid does a 6R80 take?

A full refill of a 6R80 transmission requires approximately 13 to 13.1 quarts of fluid, but a standard drain-and-fill typically only replaces about 4.5 to 7.5 quarts. The amount needed for a drain-and-fill can vary, but you will need about 7 quarts for a service kit. Always fill until the fluid is at the correct hot level on the dipstick with the engine running. 
Full capacity versus drain-and-fill

• Total capacity: 13.113.113.1 quarts (when the transmission is completely disassembled). 
• Drain-and-fill: About 4.54.54.5 to 7.57.57.5 quarts, depending on how much can be drained from the pan. 
• Service kit: A common kit includes about 777 quarts of fluid. 

How to add the fluid

1. Drain the old fluid. This is the most time-consuming part, as there is no drain plug. 
2. Replace the filter and gasket. This is a crucial step for a proper fluid change. 
3. Refill with new fluid. Add about 4 to 6 quarts of new Mercon LV fluid through the dipstick tube before starting the engine. 
4. Start the engine and let it warm up. Run the engine while shifting through the gears to circulate the fluid. 
5. Check the fluid level. Once the transmission is warm, check the dipstick and add more fluid slowly until it reaches the "hot" mark (often labeled "Bravo").