The Unsung Hero of Oil Changes: Choosing the Right Drain Bolt Crush Washer

When performing an oil change, most people focus on the oil and filter. But there’s one small component that plays a vital role in keeping everything sealed and leak-free—the drain bolt crush washer. Whether you’re using an aluminum drain plug washer, a car drain plug washer made from copper, or a size-specific crush washer M12 or crush washer M14, selecting the right one is crucial for your engine’s health. In this article, we’ll dive into the different types of washers, their function, and how to pick the right one for your car.

What Is a Drain Bolt Crush Washer, and Why Is It So Important?

The drain bolt crush washer is a small typically circular component that sits between the oil drain bolt and the oil pan. When you tighten the drain bolt, the washer compresses slightly to create a tight, leak-proof seal. Unlike reusable gaskets or O-rings, a crush washer is usually designed for single use.

Crush washers are essential because:

They prevent engine oil from leaking after an oil change.

They help maintain proper oil pressure.

They protect the oil pan surface from damage caused by overtightening the drain bolt.

Each time you change your oil, the old crush washer should be removed and replaced. Reusing a compressed washer can lead to oil leaks or damage to the oil pan.

Comparing Washer Types: From Aluminum Drain Plug Washer to Crush Washer M14

There are a few main types of car drain plug washers, each with specific materials, sizes, and applications. Choosing the correct washer depends on your vehicle’s requirements, the bolt size, and your preferences for durability and reusability.

1. Aluminum Drain Plug Washer

The aluminum drain plug washer is one of the most common types used in modern vehicles. It’s known for:

Lightweight durability

Good crushability for a tight seal

Compatibility with both steel and aluminum oil pans

These washers are ideal for DIY oil changers and professionals alike. They conform well to surfaces and don’t corrode easily, making them a popular choice across many brands.

2. Crush Washer M14

The crush washer M14 is designed for oil drain bolts with an M14 thread size—one of the most widely used sizes in Japanese and European cars. It compresses slightly when torqued down, forming a tight seal without requiring a ton of pressure.

If your car uses a 14mm drain bolt, this is likely the correct washer. You’ll often find this size in OEM parts kits or high-quality aftermarket packs.

3. Crush Washer M12

Smaller vehicles or older models may use an M12 drain bolt. A crush washer M12 is thinner in diameter but serves the same purpose. It’s crucial not to mix up washer sizes—even a few millimeters too small or large can cause sealing issues.

Where to Buy and How to Choose: Looking at Crush Washer Advance Auto Parts

When it comes to purchasing a reliable crush washer, local auto parts stores like Advance Auto Parts are a solid option. They carry various washer sizes, including both crush washer M12 and crush washer M14, and usually stock multiple materials (aluminum, copper, and nylon).

Here’s what to consider when choosing a washer:

Thread size: Check your vehicle’s owner’s manual to confirm M12, M14, or other sizes.

Mal: Copper and aluminum are best for crush-type washers; nylon may be used for less demanding applications.

Quantity: Many stores sell them in packs—buy a few extra for future oil changes.

If you're unsure of your vehicle’s washer size, Advance Auto Parts staff can often help you identify the right one by looking up your car’s make, model, and year.

Best Practices for Installing a Car Drain Plug Washer

No matter which type of car drain plug washer you use, correct installation ensures a leak-free oil change. Follow these simple steps for a reliable seal:

Remove the Old Washer: Always take off the used drain bolt crush washer. It may be stuck to the oil pan or bolt, so double-check before reassembly.

Clean Contact Surfaces: Wipe down the oil pan and bolt surface to ensure a clean, smooth fit.

Install the New Washer: Place your new aluminum drain plug washer or other crush washer onto the bolt before threading it in.

Torque the Bolt Properly: Use a torque wrench to avoid over-tightening. Too much torque can damage the washer or oil pan threads.

Check for Leaks: After your oil change, start the engine and look for drips or wet spots around the drain plug. A properly installed washer should hold strong.

Final Thoughts

It might be small, but the drain bolt crush washer plays a big role in keeping your engine oil where it belongs—inside the engine. Whether you’re using a tried-and-true aluminum drain plug washer, shopping for a crush washer at Advance Auto Parts, or figuring out if you need a crush washer M12 or crush washer M14, always prioritize quality and proper fit.

Replacing your car drain plug washer with every oil change is one of the simplest ways to prevent oil leaks and maintain engine performance. It’s a cheap, effective upgrade for anyone serious about vehicle maintenance.