Source: https://www.franchiseherald.com/articles/76765/20210830/tips-to-keeping-your-crosstrek-running-for-a-long-time.htm
To extend the lifespan of your Crosstrek, keep your engine well-maintained. This includes regular oil changes, filter replacements, and tuning of the ignition system.
To maximize your Crosstrek's lifespan, avoid driving it aggressively. High-speed driving can lead to premature wear on engine components and other parts.