Air Filter Specification
Verified OEM & Service Reference2018 Subaru Legacy 2.4L Turbo Boxer H4 (FA24) — Air Filter
Recommended interval: Every 15,000–30,000 miles (inspect annually)
Engine / Trim Variant
OEM Part Number
16546AA15A
Quick Purchase
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Compatible Aftermarket Options
Direct OEM cross-referencesNo aftermarket cross-reference listed yet. Search directly for compatible air filter options:
Search 2018 Subaru Legacy 2.4L Turbo Boxer (16546AA15A) on AmazonAir Filter Fitment by Engine / Trim (2018 Subaru Legacy)
| Engine / Trim | Oil Spec & Capacity | OEM Oil Filter |
|---|---|---|
| 2.5L Boxer H4 | 0W-20 • 4.4 qt (4.2L) | 15208AA15A |
| 2.4L Turbo Boxer (XT) | 0W-20 • 4.8 qt (4.5L) | 15208AA21A |
DIY Fitment & Verification Checklist for 2018 Subaru Legacy
- Confirm your engine code or trim variant above before ordering parts, as mid-year production changes can affect air filter fitment.
- When purchasing OEM or aftermarket brands (Motorcraft, ACDelco, Mopar, Wix, Fram, Mobil 1, Bosch, NGK), cross-check the Amazon Garage Confirmed Fit badge with your 17-digit VIN.
- Always consult your 2018 Subaru Legacy owner's manual for exact torque specs and fluid service intervals.
Sources: NHTSA vPIC & OEM Service SpecificationsReport an inaccurate spec or part number
Frequently Asked Questions
What is the OEM air filter specification for a 2018 Subaru Legacy?
The primary OEM air filter part number / specification for the 2018 Subaru Legacy 2.4L Turbo Boxer H4 (FA24) is 16546AA15A.
Which aftermarket air filter brands fit the 2018 Subaru Legacy?
Use your 17-digit VIN to confirm direct-fit aftermarket air filter replacements on Amazon.