Parts for your 2013 Mazda Premacy-Sump plug washers

2013 Mazda Premacy sump-plug-washers: what they do and when to replace

Yes, the 2013 Mazda Premacy uses a sump-plug-washer (oil drain plug gasket). Technical sources that specify this include the Mazda Workshop Manual for the CR Premacy/Mazda5 (Engine Lubrication section), which calls for replacement of the drain plug gasket at each engine oil change, and the Mazda Electronic Parts Catalogue (EPC), which lists a 14 mm crush washer for the oil drain plug—commonly referenced as Mazda part number 9956-41-400 (and superseding variants) for both LF-VE and PE-VPS (SKYACTIV 2.0) engines.

The sump-plug-washer’s job is simple but crucial: it’s a soft-metal crush ring that deforms as the plug is tightened, creating a reliable seal between the sump and the plug. That controlled “crush” prevents weeps and drips, protects the sump threads by achieving seal at the correct torque rather than brute force, and helps the plug come back out cleanly next service.

• Prevents oil leaks by sealing minor surface imperfections
• Lets the plug reach the right clamping load without over-tightening
• Acts as a sacrificial layer so the alloy sump face isn’t damaged

For servicing, replacing the sump-plug-washer at every oil change is the go-to move. Mazda’s service information specifies replacement each time the plug is removed, which lines up with best practice in Aussie and Kiwi workshops. A fresh 14 mm aluminium crush washer is the standard fitment on these engines, copper is sometimes used in the aftermarket, but Mazda specifies aluminium.

• Use a correct 14 mm aluminium crush washer suited to an M14 x 1.5 drain plug
• Clean the sump face and plug, and check the old washer isn’t stuck to the sump
• Start the plug by hand, then torque to spec—typically in the 30–41 N·m range (always confirm the exact figure in the Mazda Workshop Manual for the specific engine)
• Never double-stack washers, use thread tape, or rely on sealants
• If the plug or threads look tired, replace the plug to avoid future hassles

If any fresh oil shows up around the plug after a service, the likely culprits are a re-used washer, the wrong washer type, or under/over-torque. Keeping a small pack of genuine or quality aftermarket washers on the shelf makes life easy at service time—and the used aluminium washer can head to metal recycling.

Popular questions about 2013 Mazda Premacy sump-plug-washers

What size sump-plug-washer does a 2013 Mazda Premacy use?
It takes a 14 mm aluminium crush washer for the M14 x 1.5 oil drain plug. Mazda lists the drain plug gasket in the EPC under p/n 9956-41-400 (and supersessions). It’s smart to confirm against the vehicle’s VIN and engine code (LF-VE or PE-VPS) before ordering.

How often should the sump-plug-washer be replaced?
Every oil change. Mazda’s workshop documentation specifies replacing the washer whenever the drain plug is removed. Doing so helps ensure a leak-free seal and protects the sump face. Pair it with the correct torque, as per the service manual.

Can a sump-plug-washer be reused?
It’s designed as a single-use crush washer. Reusing can lead to weeping or needing too much torque to seal. In a pinch it might get by once, but the proper fix is a new washer at the next opportunity.