Parts for your 2015 Ford Ranger-Sump plug washers

2015 Ford Ranger sump plug washers — what they do and when to replace them

A sump plug washer is absolutely used on the 2015 Ford Ranger. Technical sources back this up: the Ford Workshop Manual for the PX Ranger (2011–2015, Duratorq 2.2L and 3.2L) instructs fitting a new drain plug sealing washer whenever the plug is removed during an oil change, and Ford TIS service procedures mirror that guidance. The shared-platform Mazda BT‑50 workshop documentation for the same engines also specifies renewing the washer. Genuine parts catalogues for the PX Ranger list an oil drain plug washer as a service item, confirming fitment on this model.

On the Ranger, the sump plug washer is a small but vital seal that sits between the drain plug head and the sump pan. Its job is to crush or compress slightly as the plug is tightened, creating a reliable seal that keeps engine oil where it belongs. That proper seal prevents weeping, protects the sump threads by reducing the need to overtighten the plug, and helps the plug hold its torque through heat cycles and vibration common in Aussie and Kiwi driving conditions.

Because the washer is designed to deform, it’s considered a single‑use consumable in service literature. Over time and with heat, a used washer hardens or takes a set, so it can’t re‑seal as well the next time. That’s why the workshop manuals say to replace it whenever the drain plug is removed. Whether the Ranger is fitted with a traditional copper/aluminium crush washer or a bonded (metal with integrated rubber) style, the best practice is “new washer, every oil change.”

Good servicing looks like this: clean the sump face, discard the old washer, fit the correct new washer for the plug style, and torque the drain plug to the factory spec for the engine variant. No sealants or tape are needed. After the oil fill and a quick idle, check for drips from the plug area. A fresh, correct washer means a dry sump and no mess on the driveway or undertray.

• Don’t double up washers, use one correct washer only.
• If the sump face is nicked, address that before refitting.
• For bonded washers, replace if the rubber looks flattened, cracked, or swollen.

What size/type washer does a 2015 Ford Ranger use?

Most PX‑series Rangers (2011–2015) use an M14 drain plug with a matching 14 mm ID crush or bonded washer. Some plugs come with a bonded seal, others use a separate copper or aluminium crush washer. The exact style can vary by engine and build, so match to the VIN or bring the old plug/washer to the parts counter to confirm.

How often should the sump plug washer be replaced?

Every time the drain plug is removed—practically, that’s every oil change. The washer deforms to seal, reusing it risks slow leaks and overtightening the plug to compensate. It’s a cheap part that protects an expensive sump.

Can the old washer be reused in a pinch?

It’s not recommended. If absolutely stuck, reuse only long enough to get a correct replacement and keep an eye out for weeping. For bonded types, never reuse if the rubber is marked or flattened. Always refit with a new, correct‑spec washer at the earliest opportunity.