2015 Jeep Grand Cherokee: Transmission Fluid and Service

Quick answer

• Transmission: ZF 8HP70 (8-speed automatic) with 3.6L V6 and 5.7L V8 engines. ZF 8HP45 with 3.0L diesel engine.
• OEM fluid spec: Mopar ZF 8&9 Speed ATF (or equivalent meeting Mopar Spec MS-90030-A5)
• Drain & fill capacity: Approximately 5.5 - 6 quarts
• Full overhaul capacity: 9.0 quarts
• Filter OEM part number: The filter is integrated into the transmission pan and is replaced as a single unit. Verify the part number with your dealer or service manual.
• Recommended service interval: "Lifetime" fill according to the manufacturer, but severe-duty service (towing, mountains, etc.) should consider a 60,000-mile interval.

Fluid type explained

The 2015 Jeep Grand Cherokee uses a specialized synthetic fluid, Mopar ZF 8&9 Speed ATF, which is specifically formulated for the ZF 8-speed automatic transmission. This is not a "one-size-fits-all" fluid. Using a non-approved fluid can lead to shifting problems, premature wear, and potential transmission failure.

Service procedure

There are two main ways to service your transmission fluid:

• Drain and fill: This is the most common method. The transmission pan is drained of its fluid, and the pan/filter assembly is replaced. The transmission is then refilled with fresh fluid. This method typically replaces about 60% of the total fluid.
• Full exchange: A fluid exchange machine is connected to the transmission cooler lines, which pumps out the old fluid while simultaneously refilling with new fluid. This method replaces nearly 100% of the old fluid and is the most effective way to ensure a clean transmission.

Service interval

While Jeep may refer to the transmission fluid as a "lifetime" fill, this is generally not recommended for longevity. For normal driving conditions, a fluid and filter change every 80,000 to 100,000 miles is a good rule of thumb. For severe duty, such as frequent towing, mountain driving, or commercial use, a 60,000-mile interval is recommended.

Common transmission problems

The ZF 8-speed is a robust transmission, but some common issues have been reported:

• Rough or delayed shifting: This can sometimes be resolved with a software update from a Jeep dealer.
• Leaking transmission pan: The plastic pan can be prone to cracking or warping, leading to fluid leaks. The pan must be replaced as a unit with the integrated filter.
• Solenoid failure: The transmission solenoids control fluid flow and shifting. A failed solenoid can cause a variety of shifting problems and will usually trigger a check engine light.

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