Apr . 10, 2025 17:24 Back to list

The Right Washer Matters: M14 and M18 Crush Washers for Oil Drain Plugs

Changing your engine oil? Don’t forget one of the most overlooked yet vital components of the job—the oil drain plug washer. Specifically, if your car uses a 14mm or 18mm drain bolt, choosing the correct size and material, like an M14 aluminum crush washer or an M18 aluminum crush washer, is crucial for a leak-free seal. This article will walk you through the key differences and where to find the right washer.

Why Use an M14 Aluminum Crush Washer?

An M14 aluminum crush washer is designed to seal the space between the oil drain bolt and the oil pan. Made from soft aluminum, it deforms slightly when tightened, creating a tight, leak-proof seal. Unlike rubber or fiber washers, aluminum holds up better under the high heat and pressure found in engine oil systems.

This type of washer is commonly used in many Japanese and European vehicles. Replacing it with every oil change ensures that the seal remains intact and prevents slow oil leaks, which can lead to bigger issues over time.

Finding the Right Fit: M14 Crush Washer AutoZone and M14 Drain Plug Washer

If you’re unsure where to get the correct washer, M14 crush washer AutoZone options are reliable and easy to access. Most auto parts retailers, including AutoZone, carry a wide selection of drain plug washers to match various makes and models.

The M14 drain plug washer refers to the washer that fits a 14mm diameter drain bolt. This size is one of the most commonly used in modern vehicles. It’s important to match the washer to your vehicle’s specs because using the wrong size can result in poor sealing and eventual leaks.

Whether you’re doing a quick oil change at home or taking your car to a shop, make sure you or your mechanic includes a new M14 oil drain plug washer in the process.

When to Use an M18 Aluminum Crush Washer

Larger vehicles or some performance engines use an M18 aluminum crush washer for their oil drain plugs. Just like the M14 version, the M18 washer provides a strong, heat-resistant seal but fits an 18mm drain bolt. Using the correct size is essential for proper oil system performance.

Replacing your M14 oil drain plug washer or M18 aluminum crush washer during every oil change is a simple step that protects your engine from oil leaks. Always choose quality materials and the right size for a secure, reliable seal.

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