How much transmission fluid does a 2015 Civic Si take?

The 2015 Civic Si manual transmission takes about 1.8 quarts (roughly 1.7 liters) of transmission fluid for a full drain-and-fill.

The six-speed manual uses Honda Manual Transmission Fluid (MTF). This capacity refers to a complete drain and refill; when topping up, fill through the side fill plug until fluid begins to seep from the hole and then reinstall the plug. If MTF is unavailable, a GL-4 75W-90 gear oil labeled as compatible with manual Honda transmissions is commonly used, but avoid GL-5 formulations that can harm synchronizers.

Fluid options for the 6-speed manual

Choosing the right fluid helps protect gears and synchronizers and ensures smooth shifting. Here are the commonly recommended options:

• Honda Manual Transmission Fluid (MTF) — OEM-recommended fluid for the Civic Si's 6-speed manual.


• GL-4 75W-90 gear oil — acceptable alternative if Honda MTF is unavailable and labeled compatible with manual Honda transmissions. Do not use GL-5 unless explicitly approved by Honda for this model.


• Avoid automatic transmission fluids (ATF) or additives not specified by Honda, as they can cause shifting issues or wear.

In short, use MTF as your first choice; if unavailable, pick a GL-4 75W-90 gear oil compatible with Honda manuals and avoid GL-5 and ATF unless advised.

Drain-and-fill procedure

Here are the standard steps for draining and refilling the Civic Si’s manual transmission. Follow these and consult the service manual for torque specs.

1. Secure the car on a level surface and raise it safely; place a drain pan beneath the transmission.


2. Remove the transmission drain plug and allow the old fluid to drain completely; reinstall the drain plug with a new washer and torque to spec.


3. Locate and remove the fill plug (usually on the side of the transmission).


4. Slowly add fluid through the fill hole until it begins to seep out of the hole; reinstall the fill plug and torque to spec.


5. Lower the car, start the engine, press the clutch, and shift through the gears to circulate the new fluid; recheck the level and top off if necessary after a short drive.

Notes: Replace any drain plug washer, use the correct fill and drain plugs, and avoid overfilling as it can foam and overflow or increase pressure.

Summary

The 2015 Civic Si with a six-speed manual transmission requires about 1.8 quarts (roughly 1.7 liters) of fluid for a full drain and refill. Use Honda MTF as the primary fluid, or a compatible GL-4 75W-90 gear oil if MTF isn’t available. Follow proper drain-and-fill steps, replace the drain washer, and recheck the level after a brief test drive to ensure correct operation.

How much transmission fluid does a 2015 Honda Civic Si take?

The 2015 Honda Civic Si manual transmission fluid capacity is 1.9 quarts (1.8 L), which is the amount needed for a full refill after draining the old fluid. Note that the manual transmission in the Si model shares its fluid with the helical limited-slip differential, so you are servicing both at once. 
This video demonstrates how to change the manual transmission fluid in a 2012-2015 Honda Civic Si: 56sJosephToddYouTube · Nov 10, 2020

• Total capacity: A full refill requires approximately 1.9 quarts or just under two quarts. 
• Service: Changing the manual transmission fluid also changes the fluid for the built-in limited-slip differential. 
• Recommended fluid: Use fluid that is compatible with Honda manual transmission specifications, such as Honda Genuine MTF. 
• Filling method: The correct level is achieved when fluid starts to overflow from the fill port on the transmission case. You should pump fluid in until this happens. 

How much transmission fluid does a 6R140 take?

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

What transmission fluid for Honda Civic Si?

Advanced fully synthetic group 4 PAO base RAVENOL MTF-2 meets or exceeds original Honda Civic MTF fluid recommendations. Fits 2006-2021 Honda Civic Si and 2017-2021 Honda Civic Type R manual transmission fluid change applications. See vehicle fitment tab to confirm fitment.

How much oil does a 2015 Honda Civic Si 2.4 take?

Engine Oil
4.4 quarts (with filter).