Engine Oil Drain Washer

OEM Part # 90080-43030 Also seen as 9008043030 Type Crush washer / gasket
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What this part is

It’s a gasket / crush washer used under the oil drain plug on Toyota engines. It seals the drain plug so oil doesn’t leak out of the oil pan.

Basic Specs (real measurements)

  • Inner diameter (hole size)
    About 12 mm (fits M12 drain plug)
  • Outer diameter (outer edge of washer)
    About 21 mm
  • Thickness
    About 1.5 – 2 mm (typical for this part)
  • Material
    Usually aluminum (aluminium)
  • Shape
    Usually crush washer / gasket shape (A-shape seal)
  • Toyota OEM part number
    90080-43030 (sometimes referenced as 9008043030)

Why these specs matter

Inner diameter
Must match the drain plug thread (M12) so it sits snug.
Outer diameter + thickness
Control sealing surface area and how much it crushes for a tight seal.
Aluminum
Soft metal that crushes slightly to seal. That’s the whole point.

3 quick examples (easy comparisons)

Example 1: Bottle cap seal
Like the soft ring in a bottle cap: it compresses to stop leaks.
Example 2: Rubber door gasket
Like a fridge door gasket: good fit + compression = no air (or oil) escaping.
Example 3: Soft washer under a faucet
Same idea: a soft piece squeezes to block water from leaking.

Simple way to remember it

Think: “12 mm hole, ~21 mm outside, ~2 mm thick, aluminum crush gasket for Toyota oil plug.”

Shortcut: 12 / 21 / 2 / Al

1-sentence summary (memory line)

Summary: Toyota 90080-43030 is an aluminum crush washer for an M12 drain plug, roughly 12 mm inner, 21 mm outer, and about ~2 mm thick.