Parts for your 2007 Toyota Bb-Sump plug washers

2007 Toyota bB sump plug washers — what they do and when to replace them

Yes, the 2007 Toyota bB is designed to use a sump plug washer. Toyota’s Electronic Parts Catalogue lists a “GASKET, OIL DRAIN PLUG” for the bB (QNC20/21 series) and commonly cites p/n 90430-12031 for the crush washer. Likewise, Toyota engine repair manuals for the 1NZ-FE and 3SZ-VE families specify refitting the drain plug “with a new gasket” during engine oil replacement. Those two technical sources make it clear the washer is an intentional, service-replaceable sealing part on this vehicle.

On the 2007 bB, the sump plug washer is a small, soft-metal gasket (usually aluminium or copper) that sits between the drain plug and the sump. Its job is simple but critical: it crushes slightly as the plug is tightened, creating a uniform seal that keeps engine oil from weeping past the threads or the plug face. That crush action also spreads the load so the plug doesn’t bite into the pan face, helping protect the sump over years of servicing.

It’s considered a one-time-use item. Each time the oil is drained, the old washer should be removed and a new one installed before the plug goes back in. Reusing a flattened washer risks tiny leaks, oil smells, drips on the driveway, or the temptation to over-tighten the plug to chase a seal — none of which is ideal for the bB’s alloy sump or the plug threads.

When servicing a 2007 bB, best practice is:

• Wipe the sump’s sealing face clean and make sure the old washer isn’t stuck on the plug or pan.
• Fit the correct-size Toyota-style crush washer, don’t stack washers.
• Tighten the drain plug to the specification in the Toyota manual — firm, not gorilla-tight.
• After the refill and a short run, check for seepage around the plug.

Choosing material? Aluminium washers are the common Toyota pick and give the right “crush feel” at spec torque. Copper works too if it’s the correct size and is purpose-made as a crush type. If there’s any sign of seepage, a nicked sealing face, or a washer that’s already been reused, just replace it — they’re inexpensive insurance for a leak-free service.

For DIYers in Aus and NZ, keeping a small pack of genuine-spec washers on the shelf makes oil changes quicker and helps the bB stay dry and tidy underneath for the long haul.

Popular questions about 2007 Toyota bB sump plug washers

What size sump plug washer does a 2007 Toyota bB use?
The bB typically uses the Toyota crush washer that suits an M12 drain plug, commonly referenced in Toyota parts catalogues as 90430-12031. Because markets and engines can vary, it’s smart to confirm by VIN in the Toyota EPC or match the new washer to the old one for inner diameter and thickness.

How often should the washer be replaced?
Every oil change. Toyota repair procedures for the bB’s engines specify installing the drain plug with a new gasket each time. That habit keeps the sealing surface fresh and reduces the risk of leaks or over-tightening.

Can copper and aluminium washers be used interchangeably?
Yes, provided the washer is the correct size and a proper crush design. Aluminium is most common on Toyotas and crushes a touch easier, copper works well too. Don’t mix materials on the same service, don’t stack washers, and always tighten to the service manual’s spec.