As you torque the drain plug, the metal of the washer flows into the microscopic imperfections of the drain port and the plug, filling any gaps that would otherwise allow oil to leak. Typically made from copper, aluminum, or a proprietary alloy, the washer is designed to deform plastically when tightened.
Crush Washer Tightening Procedure for a Leak-Free Seal
Integrating It Into Your Routine Viewing the crush washer as a permanent part of the oil change kit, rather than an afterthought, is a game-changer. Anyone who has ever slid under a vehicle to change the oil knows the frustration of a stubborn, seized drain plug.
Wipe the drain plug thread clean as well. By combining the use of a new crush washer with a consistent torque schedule, you not only prevent messy leaks but also protect the internal threads of your oil pan, preserving the integrity of one of the most critical maintenance points on your vehicle.
Crush Washer Tightening Procedure for a Leak-Free Seal
They are generally considered semi-reusable; while they can often be reinstalled a few times, it is best practice to replace them with each oil change to guarantee a perfect seal. Hand-tighten the plug securely, then use a torque wrench to apply the manufacturer's specified torque.
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