Reusing a crush washer is a primary cause of leaks, as the metal becomes work-hardened and loses its ability to seal effectively. When installing a new washer, hand-thread the plug into the drain hole to ensure the threads are properly engaged before using any tools.
Choosing Correct Crush Washer Material for a Reliable Seal
However, this material is intentionally chosen to be "one-time use. The most common failure mode is a slow, persistent leak.
Aluminum washers are a lightweight alternative that resists corrosion and can be easily reshaped for reuse. Another point of failure is cross-threading.
Choosing the Right Crush Washer Material for a Reliable Seal
If the drain plug is not started correctly on the stud, the resulting friction can generate immense heat. Following the specified torque ensures the washer deforms just enough to create a perfect, reliable seal.
More About Oil drain plug crush washer
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