The naturally aspirated four behind the Outlander — a reasonably solid engine in its own right, where the CVT transmission it's commonly paired with deserves at least as much attention as the engine itself.
This engine itself carries a reasonably solid documented track record, with variable valve timing (MIVEC) technology that Mitsubishi has refined over several generations. The more significant variable in this vehicle's overall reliability picture is the CVT it's commonly paired with — shudder and premature wear complaints on Mitsubishi's CVT implementation echo similar concerns found on CVTs from other manufacturers covered on this site, and deserve independent attention from the engine's own, generally reasonable, profile.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
Minor oil consumption, where reported, typically becomes noticeable within this range.
CVT shudder symptoms, where present, most commonly surface within this range — a separate concern from the engine itself.
Test drive under both light and firmer acceleration, feeling specifically for CVT shudder or hesitation, a separate concern from the engine itself.
Ask whether CVT fluid has ever been serviced, and treat an unserviced example as a candidate for proactive service.
Check oil level yourself if possible on higher-mileage examples, given the minor consumption reports on a subset of examples.
Model-specific pages, with notes on how it behaves in that particular car.