What size is the oil drain plug on a 3.5 EcoBoost?
The drain plug for Ford’s 3.5L EcoBoost engines is typically a 14 mm hex-head plug, with an M14x1.5 thread. Exact specifications can vary by model year and oil pan design, so always verify against your specific vehicle’s manual or service information.
In this article, we explore the common size, why variations can occur, and how to confirm the correct plug size for your exact 3.5 EcoBoost installation. We also cover practical steps for identifying the correct size and replacing the drain plug safely during an oil change.
Typical size and variations
Most 3.5L EcoBoost applications use a standard drain plug with a 14 mm hex head and M14x1.5 threads. Some variations exist depending on model year, engine block design, or aftermarket pan configurations. Always treat this as the common baseline and verify for your specific vehicle.
- Head size: commonly 14 mm hex (14 mm socket or wrench).
- Thread size: typically M14x1.5, which is a standard metric coarse thread for many Ford engines.
- Sealing method: many plugs use a copper sealing washer; replace the washer when reinstalling to ensure a proper seal.
- Possible exceptions: a minority of early or specialty configurations could differ; verify with the official manual or parts diagram for your vehicle.
For consistency and safe maintenance, treat the 14 mm/ M14x1.5 as the default reference and confirm against your exact model/year before purchasing a replacement plug or washer.
How to verify the exact size on your vehicle
To verify the plug size on your specific 3.5 EcoBoost, follow these steps to avoid confusion during an oil change.
- Check official documentation: consult the owner’s manual, Ford service website, or an authorized service bulletin for your exact year and model to confirm the drain plug specification.
- Inspect the existing plug: remove a portion of the plug (careful with hot oil) and inspect the hex head; if it looks like a 14 mm hex, that is a strong indication of the standard size. If unsure, test-fit a 14 mm socket first before attempting a full removal.
- Compare with common socket sizes: before buying, try a 14 mm socket or 9/16" (which is close in size) to see which fits snugly without rounding. If neither fits, you may have a non-standard plug and should consult the service manual.
- Check the drain plug part number: look up the plug in the Ford parts catalog for your VIN; the catalog will specify the correct plug size and any required washer.
- Ask a dealer or trusted mechanic: if you’re unsure, a quick call to a Ford dealership’s parts or service department can confirm the exact specification for your vehicle.
By following these steps, you’ll confirm the correct size and avoid cross-threading or damaging the oil pan during an oil change.
Additional considerations for a smooth oil change
Beyond sizing, note these practical tips to ensure a clean and leak-free oil change on a 3.5 EcoBoost.
- Use the correct sealing washer: if your plug requires a copper washer, replace it to maintain proper oil seal and prevent leaks.
- Do not overtighten: over-tightening a drain plug in an aluminum oil pan can strip threads or warp the pan; if you meet resistance well before the plug seats, re-check alignment and lubrication.
- Inspect the drain plug for wear: if the plug head is rounded or damaged, replace it to ensure a proper grip for future changes.
- Keep track of torque guidance: rely on the vehicle’s service information to apply the recommended torque, rather than relying on feel alone.
With the right size and proper installation practices, an oil change on a 3.5 EcoBoost can be completed efficiently with a reliable seal.
Summary
For most Ford 3.5L EcoBoost engines, the oil drain plug is typically a 14 mm hex-head with M14x1.5 thread, often using a copper sealing washer. However, exact specifications can vary by model year and pan design. Always verify with your vehicle’s owner manual or Ford service information, and consult a dealer or mechanic if you’re uncertain. Correct sizing and proper torque are essential to avoid leaks and ensure a safe oil change.
What size socket is the 3.5 Ecoboost drain plug?
You need a 15mm socket to remove the oil pan plug. If you have the undercarriage screen by Ford, you'll need an 8 MM socket to take it off.
What size is the oil drain plug on a 2013 Ford F150 3.5 Ecoboost?
The oil drain plug for a 2013 F-150 3.5L EcoBoost is a 15mm bolt head size. The corresponding thread size is M14-1.50.
- Bolt Head Size: A 15mm wrench or socket is required.
- Thread Size: The thread specification is M14-1.50.
- Additional Hardware: You will also need to remove an 8mm bolt to access the drain plug if your truck has the factory undercarriage shield.
What size is the drain plug on a 2015 F150 3.5 Ecoboost?
The 2015 F-150 3.5 EcoBoost uses an oil drain plug with an M12x1.75 metric thread and a 15 mm head. You will need a 15 mm socket or wrench to remove it.
- Thread size: M12x1.75
- Head size: 15 mm
- Tools needed: A 15 mm socket or wrench
What size socket is the oil drain plug on a Ford F150?
The F-150 oil drain plug socket size is typically 15mm for many models, but can also be 16mm depending on the year and engine. Some later models, particularly those with the 3.5L EcoBoost engine, may have a plastic drain plug that requires pliers or an 8mm socket to remove the underbody shield first.
| Socket Size | Year/Engine | Other Tools Needed |
|---|---|---|
| 15mm | Many models, including 2017 | 3/8" ratchet, possibly a 3-inch extension |
| 16mm | Older models like the 5.4L V8 from 2009-2014 | 3/8" ratchet, possibly a 3-inch extension |
| Pliers or 8mm socket | Some newer models with a plastic drain plug and underbody shield | 8mm socket, plastic pry tool, or pliers |
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