VERDICT · FREE OF THE OLDER EJ25's HEAD GASKET ISSUE
Subaru 2.0L FB20 Flat-Four
is it actually reliable?
The smaller-displacement sibling of the FB25 covered elsewhere on this site — the same meaningful architectural improvement over the older EJ-series, here in Subaru's compact Impreza.
ENGINE CODEFB20
DISPLACEMENT2.0L naturally aspirated flat-four
FUEL SYSTEMPort injection
YEARS2011–present
The short version
This engine shares the FB25's revised head gasket design, which has not reproduced the external coolant leak that defined the older EJ25's reputation. No chronic issue of significant scale has been documented across its production run, consistent with the broader pattern seen on Subaru's post-EJ engine generation.
Pros and cons
WHAT HOLDS UP
- Does not share the older EJ25's well-documented external head gasket leak tendency
- Timing chain design, avoiding a separate scheduled belt-replacement interval
- No chronic issue of significant scale documented across its production run
- Genuine all-wheel-drive security as standard, a Subaru hallmark
WHAT FAILS
- Modest power output, typical of a naturally aspirated compact car engine
- Oil consumption has been reported on a small subset of examples, generally mild
- CVT-equipped versions carry the separate Lineartronic considerations worth checking
- Less commonly discussed online than the turbocharged WRX engines
Where problems tend to appear
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
130,000+ MICore engine internals are routinely still original and sound on examples with documented maintenance.
Reliability by maintenance history
Service history
Overall risk
Verdict
Regular oil changes, documented
Low
Buy with confidence
Patchy but not neglected
Low
Still a safe buy
Long-neglected intervals
Moderate
Inspect for oil consumption
Buying one — what to check
Check oil level yourself if possible, given the minor consumption reports on a subset of examples.
If the car has a CVT, consult the dedicated transmission page for that component's own considerations.
Beyond general maintenance history, there's little else specific to flag on this meaningfully improved engine.
Where this engine shows up
Model-specific pages, with notes on how it behaves in that particular car.