Mudder Aluminum Crush Washers 100-Pack 12mm ID x 21mm OD x 1.8mm — Toyota/Scion 90430-12031 Compatible Oil Drain Plug Gaskets

Mudder 100-pack aluminum crush washers are replaceable oil drain plug gaskets sized 12 mm ID x 21 mm OD x 1.8 mm, designed to stop leaks on Toyota/Scion drain plugs (part 90430-12031).

When changing engine or transmission fluid, a fresh crush washer helps create a reliable seal between the drain plug and oil pan. These lightweight aluminum gaskets deform slightly under torque to fill irregularities and prevent oil seepage, making them a simple, low-cost maintenance item that reduces mess and protects engine components.

How do these washers reduce oil leaks during fluid changes?

Crush washers are engineered to compress and conform to the mating surfaces when the drain plug is tightened. That compression fills microscopic gaps and creates a metal-to-metal seal that resists oil under pressure, unlike hardened washers which may allow seepage.

• Soft aluminum deforms to fill surface imperfections.
• Exact 12 mm inner diameter matches many Toyota/Scion drain bolts.
• 1.8 mm thickness provides controlled crush under recommended torque.
• Thin profile avoids protrusion that could interfere with plug seating.

Will these fit my vehicle’s drain plug and how do I confirm compatibility?

The washers are produced to the dimensions commonly specified for Toyota/Scion part number 90430-12031. To verify fit, compare the inner diameter (12 mm), outer diameter (21 mm) and thickness (1.8 mm) with your drain plug and pan specifications or consult your vehicle manual.

• Inner diameter: 12 mm (0.47 inch) for bolt clearance.
• Outer diameter: 21 mm (0.83 inch) for adequate sealing area.
• Thickness: 1.8 mm (0.07 inch) for correct crush behavior.
• Refer to OEM part number 90430-12031 for direct cross-reference.

How many come in each pack and what are the benefits of buying this quantity?

This listing supplies 100 aluminum crush washers, which is convenient for frequent DIY maintenance or a professional shop. Stocking a large quantity reduces the need for repeated purchases and ensures you always have a fresh gasket for each oil or transmission fluid change.

• 100 pieces per pack—suitable for years of maintenance or multiple vehicles.
• Bulk quantity lowers cost per service compared to single washers.
• Consistent sizing across the pack simplifies inventory for shops.
• Spare washers prevent reusing old, deformed gaskets that cause leaks.

How should these crush washers be installed and when should they be replaced?

Replace the crush washer every time you remove the drain plug to ensure a fresh seal. Installation is straightforward: seat the washer on the drain bolt, hand-start the plug to avoid cross-threading, then torque to the vehicle manufacturer’s specification so the washer compresses properly.

• Always use a new washer after removing the drain plug.
• Hand-thread first, then tighten to the recommended torque—avoid over-tightening.
• Inspect mating surfaces for burrs or damage before installing a new washer.
• Dispose of any washers showing nicks or uneven compression.

Who is this for: Mudder aluminum crush washers suit DIY enthusiasts, routine-maintenance garages, and fleet shops working on Toyota and Scion vehicles that reference part 90430-12031. If you perform regular oil or transmission fluid changes and want a reliable, low-cost sealing solution in bulk, this 100-piece pack provides consistent, accurately sized gaskets so each service starts with a fresh seal.