The engine in a 2021 Ford F-150 with the 3.5 L EcoBoost typically requires about 7.5 quarts (approximately 7.1 liters) of engine oil when performing a full oil change with a new filter, using SAE 5W-20 full synthetic oil.
That capacity represents the oil needed to fill the engine to its full mark with a new filter installed. Actual top-up amounts can vary slightly depending on whether you replace the filter, drain the oil completely, or have additional oil-cooling hardware installed. The following sections break down the official specification and how to perform an oil change on this engine.
Official capacity and specifications
Ford’s documentation for the 2021 F-150 equipped with the 3.5 L EcoBoost lists an oil capacity of 7.5 quarts (7.1 L) when a oil filter is included in the change. This figure is the standard fill required to reach the proper operating level from empty with a new filter installed.
Oil specification
The recommended viscosity for this engine is SAE 5W-20 full synthetic oil. Always verify the exact specification in your owner’s manual or on the under-hood oil filler label, as regional recommendations can vary slightly and service updates may apply.
How to perform an oil change on the 3.5 L EcoBoost
Before you begin, gather the right supplies, work safely, and ensure you have a heated, level workspace. The steps below outline a typical oil-change process for the 3.5 L EcoBoost in a 2021 F-150.
- Warm the engine to operating temperature so the oil drains more completely.
- Park on a flat surface, engage the parking brake, and place wheel chocks for safety.
- Lift the front of the truck if necessary and support it securely with jack stands.
- Place an oil drain pan underneath the engine’s oil drain plug.
- Remove the drain plug and allow the used oil to drain completely into the pan.
- Remove the old oil filter and replace it with a new filter compatible with the 3.5 L EcoBoost.
- Reinstall the drain plug tightly and inspect for any leaks.
- Fill the engine with the recommended amount of 5W-20 full-synthetic oil—about 7.5 quarts (7.1 L) if you’re changing the oil and filter together. Use a funnel to avoid spills.
- Recheck the oil level with the dipstick and add small amounts of oil as needed to reach the proper full level.
- Start the engine and let it run for a minute, then check for leaks around the filter and drain plug. Recheck the dipstick once more and top off if needed.
Following these steps carefully will help ensure the engine is properly lubricated and protected after an oil change.
Considerations and tips
Oil capacity can vary slightly depending on factors such as oil cooler configurations or service advisories. If you’re unsure, consult the owner’s manual or contact a Ford service advisor to confirm the exact capacity for your specific truck and its configuration.
Summary
- Oil capacity for the 2021 F-150 with a 3.5 L EcoBoost: 7.5 quarts (about 7.1 liters) with a new filter.
- Recommended oil: SAE 5W-20 full synthetic.
- Typical oil-change steps include draining the old oil, replacing the filter, and refilling to the full level with the dipstick checked for accuracy.
- Always verify specifications in the owner’s manual and account for any vehicle-specific variations or service advisories.