Parts for your 2018 Subaru Forester-Sump plug washers

Sump Plug Washers for the 2018 Subaru Forester: What You Need to Know

When it comes to servicing the 2018 Subaru Forester, one of the routine maintenance tasks includes changing the engine oil. Alongside this, attention often turns to the sump plug and its washer. But is the sump plug washer actually relevant for this model? And if it is, what function does it serve? This piece dives into the specifics of sump plug washers on the 2018 Subaru Forester, explaining their purpose and offering some handy tips on replacement and maintenance.

The short answer is that yes, the 2018 Subaru Forester does use a sump plug washer. It is a small but critical component that plays a significant role during oil changes. Usually made from copper, aluminium or sometimes a composite material, the sump plug washer sits right beneath the sump plug itself, creating a tight seal between the plug and the oil pan.

The main job of the sump plug washer is to prevent any oil leaks. When you tighten the sump plug back into the oil pan after draining the old oil, the washer gets crushed slightly. This crush helps seal off any tiny gaps around the plug threads, stopping oil from seeping out. Without this washer, even a properly tightened plug could allow oil to leak, leading to potential engine damage if the oil level drops too low.

Why does Subaru fit a sump plug washer to the Forester? The manufacturer specifically engineers the oil pan and plug system to work with a soft-metal washer. This washer compensates for irregularities in the metal surfaces, ensures a perfect seal and withstands the heat and vibration typical under the bonnet. Plus, it is designed to be replaced every time the sump plug is removed, ensuring ongoing reliability of the seal.

Replacing the sump plug washer is as important as changing the oil itself. Subaru's maintenance schedules and technical guides strongly recommend that every time the oil drain plug is removed during servicing, the washer should be swapped out. Reusing the old washer risks an imperfect seal because once crushed, these washers do not spring back to their original shape effectively. Reusing an old washer can result in a loose fit, oil leaks and a necessity to tighten the plug excessively, which could damage the sump or plug threads.

Here are some practical tips for anyone working on the sump plug washers of a 2018 Subaru Forester:

• Always use a genuine or high-quality replacement washer specified for the Forester model year. These washers are often made from aluminium for optimal sealing and durability.
• When replacing, make sure to clean the sump plug and the bolt hole thoroughly to avoid trapping dirt or old oil residue that could interfere with sealing.
• Do not reuse the old washer. Even if it looks intact, its shape will have deformed after initial use, and it won't seal properly a second time.
• Use a torque wrench to tighten the sump plug to the manufacturer's specified torque setting. Over-tightening can damage the plug threads or crush the new washer excessively, while under-tightening risks leaks.
• Check for oil leaks after the oil change by running the engine briefly and inspecting the sump plug area.

Maintaining the sump plug washer is a small job with big importance. It supports the engine's operational health by keeping the oil system sealed and the engine lubricated properly. Ignoring the washer or reusing an old one could lead to messy oil leaks, environmental contamination, or worse, engine damage due to low oil levels. Given the relatively low cost of replacement washers, this preventative step is cheap insurance for your Forester's engine longevity.

In addition to the seal itself, the sump plug washer material is designed to withstand engine temperature fluctuations and vibration. This resilience helps prevent the washer from hardening or cracking over time, which would compromise the seal. The quality of the washer chosen during servicing matters - the better the washer, the more reliable the seal and less chance of leaks.

For DIY mechanics or even when visiting a professional workshop for an oil change on a 2018 Subaru Forester, asking about or checking the sump plug washer is worthwhile. It's a quick check to ensure everything under the car remains tight and dry. Subaru's own maintenance manuals and most reputable automotive repair sources highlight the need to replace the washer as a routine part of oil servicing.

To anyone wanting to keep their 2018 Subaru Forester running smoothly, the sump plug washer is a tiny piece of the puzzle that should not be overlooked. It might seem minor, but when it comes to preventing oil leaks and maintaining engine health, it's an essential part. Whether changing oil at home or at a mechanic, making sure a new sump plug washer is fitted every time is a smart move.