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What size is the oil drain plug crush washer on a 2018 Subaru Forester?


When performing an oil change on your 2018 Subaru Forester, one small but crucial component to consider is the oil drain plug crush washer. This tiny part plays a significant role in ensuring a proper seal and preventing oil leaks. In this article, we’ll discuss the size of the crush washer for this specific vehicle and why it’s important to replace it during every oil change.


The Correct Size for the 2018 Subaru Forester Crush Washer


The oil drain plug crush washer for a 2018 Subaru Forester is typically a 16mm aluminum or copper washer. Subaru recommends using OEM (Original Equipment Manufacturer) parts to ensure a proper fit and seal. The part number for the OEM crush washer is often listed as 803916010, but it’s always a good idea to double-check with your local Subaru dealership or trusted auto parts supplier to confirm compatibility.


Why Replacing the Crush Washer is Important


Many car owners overlook the importance of the crush washer during an oil change. However, this small component serves a critical purpose:



  • Prevents Oil Leaks: The crush washer creates a tight seal between the oil drain plug and the oil pan, preventing oil from seeping out.

  • Protects the Oil Pan: By providing a soft, compressible surface, the washer helps prevent damage to the oil pan threads when tightening the drain plug.

  • Ensures Proper Torque: The washer allows the drain plug to be tightened to the correct torque specification without over-tightening, which could lead to stripping or cracking.


How to Replace the Crush Washer


Replacing the crush washer is a straightforward process that can be done during your regular oil change. Here’s how:



  • Drain the old oil from the engine by removing the oil drain plug.

  • Remove the old crush washer from the drain plug and discard it.

  • Place a new crush washer onto the drain plug.

  • Reinstall the drain plug into the oil pan and tighten it to the manufacturer’s recommended torque specification (usually around 30-33 ft-lbs for Subaru vehicles).

  • Refill the engine with the appropriate type and amount of oil.


Final Thoughts


While it may seem like a minor detail, replacing the oil drain plug crush washer during every oil change is essential for maintaining your 2018 Subaru Forester’s engine health. Using the correct size washer ensures a proper seal, prevents leaks, and protects your vehicle from potential damage. If you’re unsure about the size or need assistance, don’t hesitate to consult your vehicle’s owner manual or reach out to a trusted auto repair professional.


Frequently Asked Questions

What size socket is my oil drain plug?


What size wrench to use for an oil drain plug depends on the size of the oil drain plug itself, which is a long bolt head. There is no universal oil plug size, but they do come in just a few several standard sizes, such as ¼ inch (. 6 centimeters), 3/8 inch (. 9 centimeters), ½ inch (1.3 centimeters), etc.



Are all oil plug gaskets the same size?


Drain plugs & gaskets vary from make, model, and even year. We recommend always checking your owners manual or any parts lookup like our Application Search to find the right drain plug. All drain plugs are not the same because all drain pans are not the same.



What size is a Subaru Forester oil drain plug?


16X17
Plug 16X17. Engine Oil Drain Plug. Depending on the production date of your vehicle, you may need a different part.



What size socket is the oil drain plug?


What size wrench to use for an oil drain plug depends on the size of the oil drain plug itself, which is a long bolt head. There is no universal oil plug size, but they do come in just a few several standard sizes, such as ¼ inch (. 6 centimeters), 3/8 inch (. 9 centimeters), ½ inch (1.3 centimeters), etc.



What size socket for Subaru drain plug?


Make sure you get the the box wrench or socket - it's a 17 mm or 11/16" size.



Is a crush washer necessary for oil drain plug?


The oil bolt gasket or washer is necessary because it creates a barrier that withstands the pressure and vibration that would alternately go onto the plug itself. The washer comes in many different materials: copper, rubber, metal, aluminum, nylon or a combination of these.



How many quarts of oil does a 2018 Subaru Forester use?


5.1 quarts
Oil Grade: SN

Viscosity:0W-20 (All TEMPS)
Capacity:5.1 quarts (with filter). After refill check oil level.
Torque:31 ft/lbs (Oil Drain Plug) Install a new washer on the drain bolt. Only use an OE drain plug.
Notes:(1) Synthetic oil is required.



What size socket do I need for oil plug?


What size wrench to use for an oil drain plug depends on the size of the oil drain plug itself, which is a long bolt head. There is no universal oil plug size, but they do come in just a few several standard sizes, such as ¼ inch (. 6 centimeters), 3/8 inch (. 9 centimeters), ½ inch (1.3 centimeters), etc.



What size is the oil plug crush washer on a Subaru?


Subaru (OEM) Oil Pan Drain Plug Crush Washer (16mm), '15-'25 WRX & '13-'25 BRZ/FR-S/86.



What size is the oil drain plug on a 2019 Subaru?


Subaru drain plugs are either 17mm or 14mm. If you were able to change the oil in your 15, the 19 should be no issue/almost identical.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.