How much fluid does a Ford PTU hold?
The Ford Power Transfer Unit (PTU) typically holds about 1.5 quarts of gear oil (roughly 1.4 liters), but the exact capacity varies by model and year. For your specific vehicle, consult the owner's manual or a Ford service bulletin to confirm.
The PTU is a compact gear assembly in Ford’s all-wheel-drive system that distributes torque between the front and rear axles. Its lubrication needs are specific to the unit and drivetrain configuration, so using the correct fluid type and maintaining proper level are important for longevity and smooth operation.
PTU capacity and what varies
Because Ford uses several PTU designs across many models, there is no single universal capacity. The following notes summarize typical ranges and practical considerations.
- Total capacity often falls in roughly 1.2–2.0 quarts (1.1–1.9 liters), depending on the PTU design and model year.
- Fluid type should be Ford-approved gear oil (synthetic 75W-90 is commonly specified). Always check the owner's manual for the exact specification.
- Service notes: Some PTUs are serviceable while others are sealed; follow Ford's procedure for draining and refilling when you perform maintenance, and replace any seals as required.
In short, the exact amount depends on the vehicle; verify the correct capacity for your model to avoid overfilling or underfilling.
How to check and top up PTU fluid
To service or top up the PTU, follow the general procedure below and always refer to the specific steps in your owner’s manual or workshop manual.
- Locate the PTU fill and drain plugs on the transfer case housing. The exact position varies by model.
- With the vehicle on a level surface, remove the fill plug and inspect the oil level. The fluid should be visible at or near the fill hole when the unit is at the proper level.
- If the level is low, add the recommended fluid through the fill hole until it begins to seep out, then reinstall the plug securely.
- Wipe away any spilled fluid and check for leaks around the fill and drain plugs after refitting.
- Dispose of used oil according to local regulations and reset any service reminders if applicable.
Maintenance note: If you notice dark or burnt-smelling oil, shiny metal shavings on the drain plug, or leaks, have the PTU inspected by a qualified technician.
Summary
Ford PTUs use different designs across models, so there is no single universal capacity. Most units hold about 1.2–2.0 quarts (1.1–1.9 liters) of gear oil, with 75W-90 synthetic gear oil commonly specified. Always confirm the exact capacity and fluid specification for your specific vehicle in the owner's manual or a Ford service bulletin, and follow the proper service procedure if you perform maintenance yourself.
How much fluid does a PTU hold?
Capacities and Specifications
| Item | Capacity |
|---|---|
| Brake fluid. | Between MIN/MAX on brake fluid reservoir |
| Rear differential fluid. | 28.07 ± 1.01 fl oz (830 ± 30 ml) |
| Power Transfer Unit (PTU) fluid. | 12.7 ± 1.7 fl oz (375 ± 50 ml) |
| Automatic transmission fluid. | 12.15 qt (11.5 L)1 |
How many quarts of oil does a transfer case hold?
Transfer case oil capacity varies significantly by vehicle, but typical amounts range from around 1.5 to 2 quarts. To find the exact capacity for your vehicle, you must consult your owner's manual, as some models may require more or less fluid. It is crucial not to overfill the transfer case, so filling it until the fluid just begins to seep out of the fill plug is a common practice.
Approximate capacities for common vehicles
- Toyota Tundra: 1.5 to 1.6 quarts for 2013-2021 models; 1.12 to 1.2 quarts for 2007-2012 models.
- Ford F-250/F-350 (2011-2016): 2 quarts.
- Ford F-250/F-350 (2017-2020): 1.9 to 2 quarts.
- Chevrolet Silverado/GMC Sierra (2019-2024): 1.6 quarts.
General advice for any vehicle
- Consult your owner's manual: The most accurate information for your specific vehicle is in its owner's manual.
- Fill to the correct level: Once you have the correct fluid, add it until it starts to flow out of the fill plug, then stop.
- Do not overfill: Overfilling can damage the seals and other components of the transfer case.
- Use the correct fluid: Always use the type of oil recommended by the manufacturer. Some transfer cases require specialized fluids, such as a GL4 rated oil, while others can use a GL5.
How often should PTU fluid be changed?
Changing or checking the PTU lubricant is not necessary unless the unit has been submerged in water or shows signs of leakage.
