Engine Oil Specification
Verified OEM & Service Reference2018 Subaru Legacy 2.5L Boxer 4-Cyl (FB25D) — Engine Oil
Recommended interval: Every 5,000–7,500 miles (8,000–12,000 km) or 6–12 months
Engine / Trim Variant
OEM Oil Spec
API SP / ILSAC GF-6A
Quick Purchase
Check verified fitment on Amazon
Technical Specifications
| Recommended Viscosity | 0W-20 |
|---|---|
| OEM Specification | API SP / ILSAC GF-6A |
| Oil Capacity | 4.4 qt (4.2L) |
Compatible Aftermarket Options
Direct OEM cross-referencesNo aftermarket cross-reference listed yet. Search directly for compatible engine oil options:
Search 2018 Subaru Legacy 2.5L Boxer H4 (API SP / ILSAC GF-6A) on AmazonEngine Oil 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 engine oil 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 engine oil specification for a 2018 Subaru Legacy?
The primary OEM engine oil part number / specification for the 2018 Subaru Legacy 2.5L Boxer 4-Cyl (FB25D) is API SP / ILSAC GF-6A.
Which aftermarket engine oil brands fit the 2018 Subaru Legacy?
Use your 17-digit VIN to confirm direct-fit aftermarket engine oil replacements on Amazon.