Parts for your 2020 Subaru Legacy-Sump plug washers

Sump Plug Washers for the 2020 Subaru Legacy: What You Need to Know

For those who own or service a 2020 Subaru Legacy, understanding the role of sump plug washers is a key part of routine oil changes and maintaining engine health. Sump plug washers might seem like a small, insignificant component, but they actually play a critical role in preventing oil leaks and ensuring a tight seal between the sump plug and the oil pan.

On the 2020 Subaru Legacy, manufacturers recommend the use of a sump plug washer. This is because the sump plug threads directly into the oil pan, and without a proper sealing washer, there's a risk that oil could leak from the drain hole. The washer sits between the sump plug head and the oil pan surface, acting as a gasket to create a pressure-tight seal when the plug is tightened down.

Sump plug washers for the 2020 Subaru Legacy are usually made from a crushable material like aluminium or copper. These materials are soft enough to deform slightly when the plug is tightened, filling any minor grooves or irregularities on the oil pan surface to ensure no gaps remain for oil to seep through. This sealing effect prevents leaks, keeps engine oil where it belongs, and helps maintain oil pressure - which is vital for proper engine lubrication.

When it comes to replacing the sump plug washer on the 2020 Subaru Legacy, it is generally advised to use a new washer every time an oil change is performed. Reusing an old washer is a common mistake that can lead to oil leaks, as the washer loses its sealing effectiveness after it has been compressed once. Although the washer might look okay after removal, it won't provide the same tight seal if refitted.

Subaru's recommended maintenance schedule highlights the importance of replacing the sump plug washer alongside the engine oil and oil filter. During an oil change, mechanics or DIY enthusiasts should remove the sump plug, discard the old washer, and replace it with a new one of the correct specification. This approach avoids seal failure and helps keep the oil change process hassle-free.

Failing to fit a new sump plug washer can have some annoying - and potentially costly - side effects. The most common problem is a slow oil leak from the sump plug area, which can cause oil spots under the vehicle. Aside from being messy, this loss of oil can eventually affect engine performance and durability. Consistently low oil levels put additional strain on engine components, potentially leading to overheating or accelerated wear.

Using the right type of sump plug washer is important, too. Subaru usually specifies an aluminium washer for the sump plug on the 2020 Legacy, as it offers the right balance of softness to crush and create a tight seal without deforming excessively. Avoid using washers made from materials that are too hard, or generic washers that don't match Subaru's specifications. These might not seal effectively and can result in leaks.

Also, it's worth noting that some aftermarket sump plugs come with a reusable sealing ring made from rubber or silicone. While these can be handy for quick oil changes, Subaru's official parts and service advice generally prefers the traditional reusable plug with a new aluminium washer each time. Sticking to OEM parts for the sump plug washer helps ensure reliability and maintains warranty compliance.

In practical terms, sump plug washers are easy to forget about, but they should be treated as an important part of your 2020 Subaru Legacy's engine care routine. Including a new washer in your standard oil change kit is a good habit. This simple, low-cost component can save owners from headaches and bigger repair bills down the track caused by slow oil leaks.

Ultimately, sump plug washers may be tiny parts, but they have a big job preventing leaks and keeping the engine oil safely contained. For the 2020 Subaru Legacy, fitting a new sump plug washer whenever the drain plug is removed is a straightforward, recommended step anyone servicing the vehicle should follow. It's one of those little details that adds up to long-term engine health and peace of mind on the road.