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Parts for your 2007 Lexus Is-Sump plug washers
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2007 Lexus IS sump plug washers — what they do and when to replace
A sump plug washer is absolutely used on the 2007 Lexus IS. The Lexus Repair Manual for the 4GR-FSE (IS250) and 2GR-FSE (IS350) specifies “replace drain plug gasket” at each engine oil change and gives a torque for the plug with the gasket in place. The Toyota/Lexus Electronic Parts Catalogue also lists an aluminium crush washer (commonly P/N 90430-12031 for most IS250/IS350 models of this era). So it’s a relevant, service-critical item on this car.
On the 2007 IS, the sump plug washer (also called an oil drain plug gasket) is a small aluminium ring that sits between the sump and the drain bolt. When tightened, it compresses slightly to form a positive seal, keeping engine oil where it belongs. Because it’s a crush-type seal, it’s intended for single use, once compressed, it won’t spring back the same way again.
As part of routine servicing, it’s smart to replace the washer at every oil change. It’s a low-cost part that helps prevent slow weeps and the odd oily spot on the driveway. Lexus service documentation calls for fitting a new gasket and tightening the drain plug to about 39 N·m (around 29 ft·lb). That torque figure assumes a new washer, over-tightening to compensate for a tired washer can risk stripping threads in the alloy sump—no one wants that bill.
Good practice looks like this:
- Warm the engine slightly, then crack the plug and drain the oil.
- Remove and discard the old washer, clean the plug and sump sealing faces.
- Fit a new aluminium washer, thread the plug in by hand, then torque to 39 N·m.
- Wipe down, refill with the correct oil, run the engine, and check for leaks under the bonnet.
Most AU/NZ 2007 IS250/IS350 cars use a 12 mm aluminium crush washer (Toyota/Lexus P/N 90430-12031). Diesel variants may use a different size and part number, so it’s worth confirming by VIN or matching the old washer. Keeping a couple of spares in the glovebox means there’s no drama come service time.
Signs a washer needs attention include a damp area around the plug, a faint oil smell after a drive, or a small drip forming overnight. Replacing it is cheap insurance for engine longevity and tidy servicing.
FAQs
Does a 2007 Lexus IS need a new sump plug washer at every oil change?
Yes. The Lexus workshop procedure specifies replacing the drain plug gasket whenever the oil is changed. The crush washer is single‑use, reusing it can lead to light seepage or the need to over‑tighten the plug, which isn’t ideal for the sump threads.
What size or part number is the sump plug washer on a 2007 Lexus IS?
For most AU/NZ IS250 and IS350 models it’s a 12 mm aluminium crush washer, commonly Toyota/Lexus P/N 90430‑12031. If the car is a diesel IS220d or has had sump or plug changes in the past, confirm by VIN or match the old washer to be safe.
What torque should the sump plug be tightened to?
About 39 N·m (roughly 29 ft·lb) with a new washer installed, as noted in Lexus service literature. Always start the plug by hand, torque with a quality wrench, then recheck for any weeping after a short drive.
