2018 Subaru Forester Oil Capacity & Filter Reference

The 2018 Subaru Forester with the 2.5L engine requires 5.1 quarts (4.8 liters) of synthetic 0W-20 oil, while the 2.0L turbo engine takes 5.4 quarts (5.1 liters).

Quick Answer: 2018 Forester Oil Specs

• Oil Capacity (2.5L FB25): 5.1 quarts / 4.8 liters with filter change
• Oil Capacity (2.0L FA20F Turbo): 5.4 quarts / 5.1 liters with filter change
• Recommended Oil Weight: 0W-20
• Oil Specification: API SN or ILSAC GF-5 (or newer API SP / ILSAC GF-6)
• Oil Filter (OEM): Subaru 15208AA15A
• Aftermarket Filter Cross-Reference:
  • Fram PH7317
  • Wix 57055
  • Mobil 1 M1-110A

Capacity by Engine Option

Oil Change Interval

Subaru recommends an oil change interval of every 6,000 miles or 6 months, whichever comes first, for all 2018 Forester models. However, your driving habits may require more frequent changes under the "severe duty" schedule.

• Normal Duty: 6,000 miles / 6 months
• Severe Duty: 3,000-5,000 miles. Consider this schedule if you frequently drive in stop-and-go traffic, live in a dusty or very cold/hot climate, or make many short trips where the engine doesn't fully warm up.

Drain Plug Torque & Crush Washer

• Drain Plug Torque: 31 ft-lbs (42 Nm)
• Crush Washer: Always replace the drain plug gasket (crush washer) to prevent leaks. The OEM part number is 803916010. It is a 16mm single-use crush washer.

How to Change the Oil (Basic Steps)

1. Warm up the engine for a few minutes to circulate the oil.
2. Safely lift and support the vehicle using jack stands.
3. Remove the plastic under-engine splash shield to access the drain plug and oil filter.
4. Place a drain pan under the oil pan, then remove the 17mm drain plug and let the old oil drain completely.
5. While the oil is draining, locate and remove the oil filter (it may be tight).
6. Wipe the filter mounting surface clean and apply a thin layer of new oil to the gasket of the new filter.
7. Install the new oil filter and hand-tighten it until the gasket makes contact, then give it an additional 3/4 to one full turn.
8. Reinstall the drain plug with a new crush washer and torque it to 31 ft-lbs.
9. Refill the engine with the specified amount of new 0W-20 synthetic oil.
10. Start the engine, let it run for 30 seconds to circulate the new oil, then shut it off. Wait a minute and re-check the oil level on the dipstick, adding more if necessary to reach the "full" mark.

Common Issues & Tips for This Generation (SJ; 2014-2018)

• Oil Consumption: Some FB25 engines in this generation were known for higher-than-average oil consumption. Subaru addressed this under warranty for many owners, but it's wise to check your oil level every other fuel fill-up. Sticking to the 6,000-mile interval (or less) and using a high-quality synthetic 0W-20 oil is critical.
• Filter Location: The oil filter is located on the top-front of the engine for the 2.0L turbo model, making it very easy to access. On the 2.5L model, it is located on the bottom of the engine, pointing upwards, which can make for a messy removal if you're not prepared. Have rags ready to catch drips.
• CVT Fluid: Do not confuse the engine oil drain plug with the nearby CVT transmission drain plug. The engine oil pan is typically black stamped steel, while the transmission pan is often cast aluminum. Double-check you are loosening the correct plug.

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