The drain plug uses a 14 mm hex head with M14 x 1.5 thread, and a new crush washer is typically required during an oil change.
Honda’s 2015 Accord came with two engines—the 2.4-liter inline-four and the 3.5-liter V6—and both generally share the same drain plug size. For definitive torque specs, washer requirements, and any regional variations, consult the owner's manual or a factory service manual specific to your vehicle's engine code and market.
Drain plug size details
What the measurements mean for maintenance
In practical terms, the 14 mm head means you’ll use a 14 mm socket or wrench to loosen and tighten the drain plug. The M14 x 1.5 thread size is the standard across many Honda models from this era, which helps when sourcing a replacement plug or aftermarket washers.
Before you begin any oil-service work, confirm you have the correct hardware and follow proper safety steps to prevent leaks or damage.
What you’ll need and why
- 14 mm drain plug socket or wrench — to fit the hex head on the plug.
- New crush washer — to create a proper seal and prevent leaks when the plug is reinstalled.
- Correct oil grade and quantity for your engine — refer to the owner's manual for the recommended specification.
- Drain pan, rag, and basic hand tools — for a clean, orderly oil-change process.
Having these items ready helps ensure a clean, leak-free drain and reinstallation without delays.
Step-by-step: removing and replacing the oil drain plug
Follow these steps to perform the drain plug operation safely and effectively.
- Warm up the engine briefly and position the vehicle on a level surface with parking brake engaged. Place a drain pan under the oil pan.
- Using a 14 mm socket or wrench, loosen the drain plug counterclockwise until the oil begins to drain, then remove it completely and let the oil drain.
- Inspect the drain plug and drain hole for any debris. Replace the old crush washer with a new one on the drain plug.
- Thread the drain plug back in by hand to avoid cross-threading, then tighten with the 14 mm tool to the manufacturer’s specified torque (consult the manual for the exact value).
- Wipe away any oil around the drain hole, replace the oil pan plug plate if applicable, and lower the vehicle if it was raised.
- Refill the engine with the correct amount and grade of oil, run the engine briefly, and then recheck the oil level, looking for leaks around the drain plug.
Using the right torque and a new crush washer helps prevent leaks and potential damage to the oil pan threads. Always verify the exact torque specification in your vehicle’s service documentation, as it can vary by engine version and market.
Notes on engine variants and compatibility
While the 2015 Accord offered both a 2.4L i4 and a 3.5L V6, the oil drain plug size is commonly reported as the same 14 mm head with M14 x 1.5 threads for both engines. If your vehicle is a departure from the standard configuration or has been serviced with non-OEM parts, double-check by inspecting the plug head or consulting a dealership service bulletin for your VIN.
In all cases, refer to the exact specifications in your owner's manual or a factory service manual. Regional variations can occur, and using the correct torque and washer is essential to maintaining an oil-tight seal.
Summary
The 2015 Honda Accord typically uses a 14 mm hex-head oil drain plug with M14 x 1.5 threads, and a new crush washer is recommended when performing an oil change. Gather the right tools, follow a careful step-by-step process, and consult your manual for torque values to ensure a leak-free install. This approach applies to both the 2.4L and 3.5L engine variants commonly found in this model year.