* Maintenance: Regular and proper maintenance, including oil changes, filter replacements, and addressing any issues promptly, significantly extends engine life. Neglect leads to premature wear.
* Driving habits: Aggressive driving, frequent short trips, and towing heavy loads put more stress on the engine and reduce its lifespan.
* Model year and engine type: Different Forester generations and their respective engines have varying inherent reliability and potential lifespans. Some engine types may be more prone to specific problems than others.
* Environmental conditions: Extreme temperatures and harsh road conditions can contribute to faster wear.
While some Subaru Foresters have been reported to reach 200,000 miles or more with proper care, others might experience significant issues much sooner. You'll find widely varying anecdotal reports online. A more realistic expectation, considering all the variables, would be somewhere in the 150,000-200,000 mile range with diligent maintenance. But this is just a broad estimate, and individual experiences will vary considerably.
