Parts for your 2019 Subaru Outback-Sump plug washers

Sump Plug Washers for the 2019 Subaru Outback: What You Need to Know

When it comes to maintaining a 2019 Subaru Outback, one of the small but important components that often gets overlooked is the sump plug washer. You might be wondering if this tiny piece even exists on the Outback or if it plays any role at all. After referencing various technical sources and Subaru service manuals, it turns out that the 2019 Subaru Outback does indeed use a sump plug washer on its oil drain plug.

So what's the deal with sump plug washers, and why should anyone care? The sump plug washer, sometimes called a crush washer or sealing washer, is a small ring that sits between the sump plug (drain plug) and the oil pan. Its job is critical - it provides a tight seal to prevent engine oil from leaking out during operation. Over time, as the sump plug is removed and refitted during oil changes, this washer can become compressed, damaged or deformed, which can cause oil leaks.

On the 2019 Subaru Outback, the sump plug washer is typically made of aluminium, a soft metal which allows it to deform slightly and create that perfect seal when the sump plug is torqued down. This is an intentional design choice by Subaru to ensure the oil pan and plug are sealed without needing complicated machining or additional sealing compounds.

Why replace the sump plug washer on the 2019 Subaru Outback? Well, the washer is designed for one-time use. When tightening the sump plug during an oil change, that aluminium washer 'crushes' to fill small gaps and irregularities on the sump plug and oil pan surfaces. During the next oil change, if the old washer is reused, it may not seal properly, which can cause tiny oil drips or worse, leaks that lead to low oil levels and potential engine damage.

Replacing the sump plug washer is a simple but highly effective way to avoid leaks and keep your Outback running smoothly. Subaru recommends fitting a new sump plug washer every time the oil is changed. Most genuine Subaru washers are inexpensive and readily available through dealerships or reputable auto parts stores, so there really isn't a reason to skip this small maintenance step.

If you're planning on servicing your 2019 Subaru Outback at home, it's a good idea to stock up on sump plug washers and always have a fresh one on hand. When removing the sump plug during an oil change, inspect the old washer - you'll likely notice it is flattened or scratched. Just swap it out for a new one before tightening the sump plug back on. Using the correct torque setting is important too, so refer to the Subaru service manual for the specified torque value to avoid over-tightening or under-tightening.

Some people wonder if it's okay to just use some thread sealant or epoxy instead of a washer, but Subaru's design doesn't call for this. Adding sealants can sometimes interfere with the metal-on-metal sealing that the aluminium washer provides and may cause improper sealing or damage the threads. Stick with the OEM specified sump plug washer to keep things simple and safe.

Not renewing the sump plug washer can also make it tricky to properly torque the plug when reinstalling. The washer helps absorb some pressure and ensures the plug seats firmly without getting stuck or overtightened, which is especially useful for DIY mechanics or those who frequently change their own oil.

To recap a few simple tips when it comes to sump plug washers and the 2019 Subaru Outback:

• Always replace the sump plug washer every oil change.
• Use the correct Subaru specified aluminium washer.
• Torque the sump plug to Subaru's recommended settings.
• Avoid using sealants or other aftermarket compounds unless explicitly advised.
• Check the sump plug and washer for damage or thread wear while servicing.

All up, the sump plug washer may be small and easy to miss, but it is a crucial part of maintaining a proper oil seal on the 2019 Subaru Outback. A proper seal means no drips, no leaks and peace of mind knowing the engine oil is safe and sound where it should be. Paying attention to these minor details can help prevent bigger engine problems down the track and save you unnecessary stress or expense.

So next time you or your mechanic is cracking open the sump plug for an oil change on the 2019 Subaru Outback, don't forget the humble sump plug washer. It might just be one of the simplest parts, but it deserves its place on the maintenance checklist.