2015 Jeep Wrangler: Transmission Fluid and Service

Quick answer

• Transmission: Mercedes-Benz W5A580 (NAG1) 5-speed automatic
• OEM fluid spec: Mopar ATF+4
• Drain & fill capacity: Approximately 5.5 quarts
• Full overhaul capacity: 8.1 quarts
• Filter OEM part number: 52108325AA (verify with dealer or service manual)
• Recommended service interval: 60,000 miles (normal) or 30,000 miles (severe duty)

Fluid type explained

The 2015 Jeep Wrangler comes equipped with a Mercedes-Benz W5A580 (also known as NAG1) 5-speed automatic transmission. This is a robust and reliable transmission that requires a specific fluid to function correctly. The OEM-specified fluid is Mopar ATF+4.

ATF+4 is a synthetic-based fluid with a unique additive package designed for Chrysler/Jeep/Dodge transmissions. Using a fluid other than ATF+4 can lead to poor shifting, torque converter shudder, and premature transmission failure.

Service procedure

There are two common ways to service the transmission fluid: a drain and fill or a full fluid exchange. A drain and fill is the simpler of the two and involves draining the transmission pan and refilling it with fresh fluid. This typically replaces about half of the total fluid in the transmission.

A full fluid exchange uses a machine to pump out all of the old fluid while simultaneously pumping in new fluid. This is a more thorough service that replaces nearly 100% of the old fluid. While a drain and fill is sufficient for most situations, a full exchange is recommended if the fluid is burnt or has not been changed in a long time.

Service interval

The recommended service interval for a 2015 Jeep Wrangler depends on how it's used. For normal driving, a transmission fluid and filter change is recommended every 60,000 miles. However, if the vehicle is used for severe duty, such as towing, off-roading, or heavy hauling, the service interval should be shortened to every 30,000 miles.

Common transmission problems

The W5A580 is a generally reliable transmission, but some common issues have been reported. These include:

• Solenoid failure: The transmission uses several solenoids to control shifting. If one of these fails, it can cause erratic shifting or a complete loss of gears.
• Valve body issues: The valve body is a complex component that directs the flow of transmission fluid. Over time, the valve body can become worn or clogged, leading to shifting problems.
• Torque converter shudder: This is a common problem with many automatic transmissions, and it can be caused by a variety of factors, including worn-out fluid, a failing torque converter, or a problem with the torque converter clutch solenoid.

Regular maintenance with the correct fluid and filter is the best way to prevent these problems and ensure a long life for your transmission.

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