Apr . 17, 2025 15:21 Back to list

Oil Crush Washers: Small Parts, Big Impact on Engine Health

An oil crush washer is a simple but vital component used during oil changes. It sits between the oil drain plug and the oil pan, and its purpose is to create a tight, leak-proof seal when the drain plug is torqued down. Typically made from soft metals like copper or aluminum, this washer deforms slightly—hence the term “crush”—to conform to the mating surfaces and prevent oil from leaking. Without a proper oil plug crush washer, even a perfectly done oil change can result in slow leaks that harm your engine over time.

When and Why to Replace a Drain Plug Washer

The drain plug washer should be replaced with every oil change. Many people make the mistake of reusing these washers, especially when they seem to be in good shape. However, the effectiveness of a crush washer lies in its ability to deform and mold to the surface each time it’s tightened. Reusing it compromises that ability and may lead to oil leaks.

Over time, even small oil leaks caused by a worn or reused drain plug washer can lower oil levels, reduce engine lubrication, and lead to serious engine wear or overheating. Replacing this inexpensive part regularly is a small step that pays off in long-term vehicle health.

Sizing Matters: The Role of the 12mm Crush Washer

Choosing the right size washer is just as important as replacing it. A 12mm crush washer is commonly used for vehicles with a 12mm oil drain plug. Always check your car’s manual or consult a mechanic to ensure you're using the correct size. An undersized washer won't fit the plug, while an oversized one may not seal properly.

Whether it's a 12mm crush washer or a larger variant, the correct fit ensures maximum contact and a proper seal. Using the wrong size can result in stripped threads, uneven pressure, or a plug that loosens over time—all of which can cause serious engine problems.

A simple oil crush washer or oil plug crush washer may seem insignificant, but it plays a crucial role in maintaining your engine’s performance and preventing leaks. Always replace your drain plug washer with the right-sized, high-quality crush washer—like the commonly used 12mm crush washer—every oil change to ensure your engine stays healthy and leak-free.

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