Parts for your 2007 Mazda Premacy-Sump plug washers

2007 Mazda Premacy sump plug washers

Based on Mazda’s own service literature, the 2007 Mazda Premacy (CR series, also known as Mazda5) uses a crush-type sump plug washer. The Mazda CR Workshop Manual instructs fitting a new drain plug gasket at each oil change and torquing the plug to specification, and the Mazda Electronic Parts Catalogue lists a 14 mm oil drain plug gasket for this model (commonly referenced as Mazda part number 9956-41-400, with the drain plug itself often cited as N3H1-10-404). These technical sources confirm the washer is required and designed as a replaceable sealing component.

The sump plug washer on a 2007 Mazda Premacy is a small, single-use hero. It sits between the sump (oil pan) and the drain plug, and when tightened, it crushes slightly to create a tight seal. That crush action compensates for tiny imperfections on the mating surfaces, stopping drips and weeps that can stain the driveway and, worse, lower engine oil levels over time.

For servicing, it’s best practice to replace the sump plug washer at every oil change. Mazda’s workshop guidance spells this out, and it’s cheap insurance against leaks. A fresh washer prevents the temptation to overtighten the plug to stop a slow seep, which can strip threads in the alloy sump—an expensive fix compared to a simple gasket.

When choosing a replacement, go for a quality 14 mm crush washer (aluminium or copper) that matches OEM spec. Clean the mating face on the sump, thread the plug in by hand first to avoid cross-threading, and tighten to the specified torque—typically 30–41 N·m for CR-series Premacy engines. Sticking to that torque range helps the washer crush correctly and keeps the sump healthy.

There are a few easy signs it’s time for attention: a faint oil ring around the plug after a service, the smell of hot oil after a drive, or a small drip forming on the bottom of the plug. If the plug’s been removed for any reason—inspection, sump cleaning, or a second drain after a wrong fill—use a new washer again. Don’t double up old washers, and don’t re-use a crushed one, they’re designed for a single crush cycle only.

• Replace the washer at each oil change.
• Use a correct-spec 14 mm crush washer (OEM-equivalent).
• Tighten the drain plug to around 30–41 N·m.
• Check for seepage after the first heat cycle and recheck torque if needed.

Look after that tiny washer and the Premacy’s MZR engine will stay tidy and happy between services.

Popular questions about 2007 Mazda Premacy sump plug washers

What size sump plug washer does the 2007 Premacy use?
It uses a 14 mm crush washer designed for the Mazda drain plug. Many parts catalogues list it under Mazda 9956-41-400. Aluminium or copper versions are fine so long as they meet OEM dimensions.

Can the sump plug washer be reused?
Not recommended. It’s a crush-type seal, intended for a single use. Reusing can lead to weeps or the need to overtighten the plug, risking sump thread damage.

What torque should the sump plug be tightened to?
For CR-series Premacy engines, the workshop spec typically falls around 30–41 N·m. Always confirm for your specific engine variant, and use a torque wrench for best results.