Legacy Second- and third-generation (BD/BG, BE/BH), 1996–2004 non-turbo EJ25 models
Track coolant level as routine maintenance on a 1996–2004 non-turbo Legacy
- Repair-trade press describes the naturally aspirated SOHC EJ25 in this window as prone to a slow head-gasket leak, most often surfacing near the 100,000-mile mark — check coolant level at every oil change rather than waiting for a warning light.
- A gradual, unexplained need to top off coolant over several fill-ups is the earliest sign reported; a sudden overheat is described as a late-stage symptom, not the first one.
- This is a reported repair-industry pattern, not a confirmed Subaru defect rate or TSB finding — don't assume every non-turbo Legacy of this era will develop it.