2018 Subaru WRX Oil Capacity: WRX vs. WRX STI
2018 Subaru WRX Oil Capacity: WRX vs. WRX STI with application chart, generation boundaries, verification steps and official manufacturer lookup.
Subaru specifies 5.4 US qt (5.1 L) for a 2018 WRX oil-and-filter change and 4.5 US qt (4.3 L) for the 2018 WRX STI. The two turbo models do not share one refill quantity.
Subaru specifies 5.4 US qt (5.1 L) for a 2018 WRX oil-and-filter change and 4.5 US qt (4.3 L) for the 2018 WRX STI. The two turbo models do not share one refill quantity.
These figures are limited to the 2018 U.S. WRX with the FA20DIT and WRX STI with the EJ257. They should not be transferred to the later FA24 WRX, an earlier EJ-series car or another market without checking its manual.
Interactive 2018 WRX / WRX STI specification guide
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Orientation aid only. Match the VIN, engine, trim and manufacturer document before use.
Subaru Wrx Oil Capacity Specifications
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| 2018 WRX oil and filter | 5.4 US qt | 5.1 L; 4.5 Imperial qt |
| 2018 WRX STI oil and filter | 4.5 US qt | 4.3 L; 3.8 Imperial qt |
| Specified viscosity | SAE 5W-30 synthetic | Both guide rows |
| Oil quality | API SN RC or ILSAC GF-5 | Final level by dipstick |
Subaru calls for synthetic SAE 5W-30 meeting API SN with Resource Conserving wording or ILSAC GF-5 in this guide. Add less than the stated service quantity first, run the engine and inspect for leakage, wait on level ground for drain-back, and finish at the full mark. The STI's lower published quantity is not a typo and the WRX figure is not a safe substitute.
Application boundaries for 2018 WRX / WRX STI
These figures are limited to the 2018 U.S. WRX with the FA20DIT and WRX STI with the EJ257. They should not be transferred to the later FA24 WRX, an earlier EJ-series car or another market without checking its manual.
Subaru calls for synthetic SAE 5W-30 meeting API SN with Resource Conserving wording or ILSAC GF-5 in this guide. Add less than the stated service quantity first, run the engine and inspect for leakage, wait on level ground for drain-back, and finish at the full mark. The STI's lower published quantity is not a typo and the WRX figure is not a safe substitute.
Subaru 2018 WRX / WRX STI specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Procedures used with this specification
These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Subaru 2018 WRX / WRX STI.
2018 Subaru WRX Oil Capacity: WRX vs. WRX STI FAQs
How much oil does a 2018 Subaru WRX take?+
5.4 US qt (5.1 L) for an oil-and-filter change on the 2018 WRX. The 2018 WRX STI takes 4.5 US qt (4.3 L) — the two turbo models do not share one quantity.
Why does the STI hold less oil than the WRX?+
They are different engines: the WRX uses the FA20DIT and the STI the EJ257. The STI's lower published quantity is not a typo, and the WRX figure is not a safe substitute.
Which oil grade do both cars use?+
Synthetic SAE 5W-30 meeting API SN with Resource Conserving wording, or ILSAC GF-5, in this guide.
Do these figures cover the newer FA24 WRX?+
No. They are limited to the 2018 U.S. WRX and WRX STI and should not be transferred to the later FA24 WRX, an earlier EJ-series car, or another market without checking its manual.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
12018 Subaru WRX and WRX STI Quick Guide — engine oilPrimary Subaru guide specifying 5.4 US qt for WRX, 4.5 US qt for WRX STI and synthetic 5W-30 meeting API SN Resource Conserving or ILSAC GF-5.↗