Parts for your 2012 Subaru Impreza-Sump plug washers

Sump Plug Washers on the 2012 Subaru Impreza: What You Need to Know

When it comes to maintaining a 2012 Subaru Impreza, one of the small but important parts to keep an eye on is the sump plug washer. These little washers might not seem like much, but they play a vital role in ensuring the sump plug seals properly and your engine oil stays exactly where it should be. For the 2012 Subaru Impreza, sump plug washers are indeed relevant and used, so understanding their purpose and maintenance can save the car owner from surprises down the track.

The sump plug washer is a thin, usually metal or sometimes crushable aluminium ring that sits between the sump plug and the oil pan. Its main job is to create a tight seal, preventing oil leaks from the sump plug aperture. Without a proper seal, engine oil could seep out, leading to a drop in oil levels which is bad news for any engine, including the 2012 Subaru Impreza's boxer engine.

On the 2012 Subaru Impreza, the sump plug washer sits under the sump plug which is removed whenever the engine oil is drained during an oil change. Subaru specifies the replacement of the sump plug washer each time the sump plug is removed as it is designed to deform slightly and create a seal when compressed. Reusing an old washer can lead to leaks because it won't seal as well the second time around.

Replacing the sump plug washer is straightforward but important. When servicing the oil, after draining the old oil and removing the sump plug, the technician or car owner should replace the old washer with a fresh OEM washer or an approved equivalent. This ensures the sump plug seats correctly and seals properly against the oil pan surface.

Using the correct washer size and material is critical. The 2012 Subaru Impreza typically uses a copper or aluminium washer that matches the original manufacturer's specifications. These metals are chosen for their ability to deform slightly under torque, which creates that crucial oil-tight seal. Using substitute washers made from incompatible materials can result in leaks or damage to the sump plug or sump housing threads.

Torque specifications matter too. Subaru's recommended torque setting for the sump plug on the 2012 Impreza ensures that the washer crimps just enough to seal without being crushed too hard or left too loose. Over-tightening can damage the washer and strip the sump plug threads, while under-tightening increases the risk of oil leaks.

For those who prefer DIY maintenance, simply remember to order the sump plug washers in advance and keep them on hand with each oil change. It pays to have genuine Subaru parts as they are engineered specifically for this vehicle. Even if a third-party option looks similar, there is no guarantee it will perform as well, especially since the washer's thickness and metal type impact sealing performance.

Getting into habits of inspecting the washer during every oil change helps prolong the life of the Impreza's engine. Oil leaks at the sump plug are often one of the first signs that the washer needs replacement or that the sump plug was not torqued properly. Fixing a leaking sump plug quickly prevents oil loss and keeps engine internals well lubricated.

When doing a service, a quick checklist around the sump plug washer looks like this:

• Remove the sump plug and old washer carefully.
• Inspect the washer for any signs of flattening, cracks or deformation.
• Always replace with a new washer matching Subaru's specs.
• Clean the seating surface of the sump plug and oil pan before fitting.
• Fit the sump plug with the new washer and torque correctly to Subaru's guidelines.
• Check for leaks after refilling oil and running the engine briefly.

It is a minor part but using the wrong washer or ignoring replacement can cause annoying oil leaks and potential engine damage over time. For 2012 Subaru Impreza owners, respecting this simple part during every oil service is a sure way to maintain peace of mind and engine health.

In the end, the sump plug washer might be out of sight but it certainly should not be out of mind. Keeping these washers fresh, installed properly and torqued right will help the Impreza's engine maintain its reliable performance on the road or the track.