This simple component is essential for maintaining the integrity of the oil system and preventing costly repairs due to contamination or low oil levels. While copper washers are often recommended to be replaced with every oil change due to their tendency to deform permanently, high-quality aluminum or steel washers can sometimes be reused if they retain their shape and are not scratched or cracked.
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When reinstalling the plug, hand-tighten it first, then use a wrench to tighten it to the manufacturer’s specified torque. The washer fills the gaps, ensuring that the oil flows smoothly out during a change and remains securely contained afterward.
This thin disc, often made of copper, aluminum, or steel, sits between the drain plug and the oil pan, creating a seal that prevents oil from leaking out after an oil change. They are also reusable, provided they are carefully inspected for damage.
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If you notice a persistent oil leak dripping from the drain plug area immediately after an oil change, a faulty washer is usually the culprit. Matching the washer to the specific application ensures that it fits snugly within the drain plug seat, preventing the blow-by of oil and ensuring a consistent seal for the life of the engine.
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