2015 Jeep Wrangler Fluid Type & Capacity Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	SAE 5W-20, API SN, Chrysler MS-6395	6.0 qt (5.7 L)
Engine Coolant	Mopar OAT (Purple), MS-12106	10.5 qt (9.9 L)
Automatic Transmission Fluid	Mopar ATF+4, MS-9602	9.0 qt (8.5 L) initial fill
Manual Transmission Fluid	Mopar Manual Transmission Lubricant, MS-9224	2.15 qt (2.0 L)
Transfer Case Fluid	Mopar ATF+4	2.1 qt (2.0 L)
Front Differential (Dana 30/44)	SAE 80W-90 Gear & Axle Lubricant	2.1 pt (1.0 L) / 2.7 pt (1.3 L)
Rear Differential (Dana 35/44)	SAE 80W-90 Gear & Axle Lubricant	3.8 pt (1.8 L) / 4.75 pt (2.25 L)
Brake Fluid	DOT 3	As needed
Power Steering Fluid	Mopar Power Steering Fluid +4	As needed
Windshield Washer Fluid	Mopar All Weather Concentrate	~1 gal (~3.8 L)

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Engine Oil

Specification: API Certified SAE 5W-20 Engine Oil, meeting Chrysler MS-6395.

For the 3.6L Pentastar V6 engine in your 2015 Wrangler, the factory specifies a high-quality 5W-20 synthetic blend or full synthetic oil. It is critical to use an oil that meets the Chrysler MS-6395 specification to ensure proper lubrication and protection of internal engine components. Using a different viscosity, such as 5W-30, can interfere with the proper function of the variable valve timing (VVT) system, potentially leading to fault codes and long-term wear.

Capacity: 6.0 quarts (5.7 liters) with filter change.

Interval: While the owner's manual suggests intervals as long as 10,000 miles, most owners and technicians recommend a 5,000–7,500-mile interval, especially if you use your Wrangler for off-roading, towing, or frequent short trips. Always check the oil level monthly.

Engine Coolant (Antifreeze)

Specification: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology) meeting Chrysler MS-12106.

This is one of the most critical and commonly confused fluids. The 2015 Wrangler uses a specific purple-colored OAT coolant. Do not mix this with other coolant types. Specifically, do not use the older orange/red HOAT (Hybrid Organic Additive Technology) coolant found in older Jeeps, or any generic green or yellow universal coolant. Mixing coolant chemistries can cause it to gel, leading to catastrophic blockages in the radiator, heater core, and cooling passages, resulting in severe engine overheating and damage.

Capacity: 10.5 quarts (9.9 liters).

Interval: The factory fill is designed to last 10 years or 150,000 miles. When servicing the system, always drain and flush completely before refilling with a 50/50 mixture of distilled water and the specified Mopar MS-12106 OAT coolant.

Transmission Fluid

Automatic Transmission (545RFE / W5A580)

Specification: Mopar ATF+4 Automatic Transmission Fluid, meeting MS-9602.

Like the coolant, transmission fluid is not a place for substitutes. Use only fluids licensed as ATF+4. Do not use generic "multi-vehicle" ATF or other types like Dexron or Mercon. Chrysler automatic transmissions are famously sensitive to fluid chemistry, and using the wrong type will cause shift problems, torque converter shudder, and eventual transmission failure.

Capacity: A drain and fill is typically 5.5 quarts. A full system overhaul requires approximately 9.0 quarts (8.5 liters).

Manual Transmission (NSG370)

Specification: Mopar Manual Transmission Lubricant, meeting MS-9224.

This is a specific fluid that is not the same as gear oil or ATF. For smooth shifting and synchronizer longevity in the 6-speed manual, stick with the OEM-spec fluid. Some owners have reported success with other high-quality synthetic manual transmission fluids, but the factory fluid is the safest bet.

Capacity: 2.15 quarts (2.0 liters).

Transfer Case Fluid (NV241)

Specification: Mopar ATF+4 Automatic Transmission Fluid.

Yes, your 4WD system's transfer case uses automatic transmission fluid, not gear oil. This is a common point of confusion. Using thick gear oil will starve the internal components of proper lubrication and lead to failure. Stick with the same ATF+4 you use in the automatic transmission.

Capacity: Approximately 2.1 quarts (2.0 liters).

Differential Fluid (Gear Oil)

Specification: SAE 80W-90 Gear & Axle Lubricant (Mopar Part # 68218041AA or equivalent).

This applies to the front and rear axles on standard Sport and Sahara models. If your Wrangler is a Rubicon or is equipped with the optional Trac-Lok® limited-slip rear differential, a friction modifier additive must be included. Most quality aftermarket gear oils for limited-slip differentials already have the modifier blended in, but if you are using standard gear oil, you must add 4 ounces of Mopar Limited-Slip Additive (MS-10111).

• Front Axle Capacity: Dana 30: 2.1 pints (1.0 L) | Dana 44: 2.7 pints (1.3 L)
• Rear Axle Capacity: Dana 35: 3.8 pints (1.8 L) | Dana 44: 4.75 pints (2.25 L)

Note for Towing: If you frequently tow a trailer, the manufacturer recommends switching to a heavier synthetic SAE 75W-140 gear oil in the rear differential for added protection, but the friction modifier requirement still applies if you have a Trac-Lok differential.

Brake & Clutch Fluid

Specification: DOT 3 Brake Fluid.

For both the brake system and the hydraulic clutch on manual transmission models, a high-quality DOT 3 fluid is required. You can use DOT 4 fluid as a compatible upgrade, as it has a higher boiling point, but never use DOT 5 fluid. DOT 5 is silicone-based and is not compatible with the seals in a DOT 3/4 system.

Capacity: Fill as needed. A full system flush will typically use less than 1 quart.

Power Steering Fluid

Specification: Mopar Power Steering Fluid +4 (also acceptable is Mopar ATF+4).

This is another Chrysler-specific fluid requirement. Do not use generic power steering fluid. The system is designed to use the same chemistry as the automatic transmission, so Mopar ATF+4 or the specifically labeled Power Steering Fluid +4 (which is essentially the same product) should be used to prevent seal damage and pump noise.

Capacity: Fill to the level indicated on the reservoir cap/dipstick.

Windshield Washer Fluid

Specification: Mopar All Weather Concentrate or any quality commercial washer fluid.

There are no strict specifications here. Use a fluid that is appropriate for your climate (e.g., one with de-icing properties for winter months). Never use plain water, as it will not clean effectively and can freeze and crack the reservoir and lines.

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