Parts for your 2010 Subaru Impreza-Sump plug washers

2010 Subaru Impreza Sump Plug Washers

Yes, the 2010 Subaru Impreza uses a sump plug washer. Subaru’s factory Service Manual for the 2010 model year (Engine/Lubrication section) specifies a replaceable crush-type gasket for the engine oil drain plug, and the Subaru electronic parts catalogue (FAST) lists a dedicated drain plug gasket for this vehicle. So, a sump plug washer is absolutely relevant to servicing a 2010 Subaru Impreza.

A sump plug washer (also called a drain plug gasket) is a small, soft-metal ring—usually aluminium—that sits between the sump plug and the oil pan. When the plug is tightened, the washer “crushes” slightly to create a tight, reliable seal. That crush action does two big jobs: it keeps engine oil from weeping past the threads, and it protects the sump and plug faces from galling. On the 2010 Impreza, using a fresh crush washer helps keep oil where it belongs and saves the hassle of drips on the driveway.

Best practice on these Subarus is to replace the washer at every oil change. The washer is designed for one-time compression, reusing it can lead to minor leaks or needing to overtighten the plug. With a new washer fitted, torque the sump plug to the factory spec (around 44 N·m/33 ft‑lb—check the exact figure for the specific engine code). Tightening to spec gives the correct crush and avoids stripping the threads in the alloy sump.

Handy tips for owners and techs looking after a 2010 Impreza:

• Use a quality aluminium crush washer suited to Subaru drain plugs, genuine or reputable aftermarket is fine.
• Clean the plug and sump mating surfaces before refitting—no old washer, no grit, no dramas.
• Start the plug by hand to avoid cross-threading, then torque to spec—don’t “gorilla” it.
• After the first heat cycle, have a quick look for any weep and wipe it clean if needed.
• If the plug’s hex is rounded or the magnet (if fitted) is loose, replace the plug as well.

For Kiwi and Aussie conditions—plenty of short trips, heat, and dust—sticking to regular oil changes and swapping the washer each time is cheap insurance. Keep a couple of spares in the glovebox so the next service is sorted without a parts run.

Do they really need a new washer every oil change?

Yes—Subaru’s service literature calls for replacing the crush washer each time. It’s a one-use seal that deforms to fit. Reusing it can cause small leaks or tempt overtightening. They’re inexpensive and save headaches.

What type of washer does a 2010 Impreza take?

An aluminium crush washer sized for Subaru’s engine oil drain plug. There are minor variations by engine code, so match by VIN or existing part if unsure. Stick with alloy crush types rather than fibre or rubber for proper sealing and torque accuracy.

What’s the correct torque for the sump plug?

Typically about 44 N·m (33 ft‑lb) with a new washer on a 2010 Impreza. Always confirm for your specific engine code. Start the plug by hand, fit a fresh washer, and torque it—if there’s a weep, don’t just crank it tighter, inspect the washer and sealing faces.