When to change transmission fluid for 2017 sonota

According to the workshop manual, "In principle, the transmission oil is maintenance-free, and no exchange is required. But it must be inspected and replenished every 4 years or 40,000 miles." Also, "Severe duty" conditions has the fluid replaced every 60,000 miles. Many conditions indicate "severe duty", so it's best to assess your driving habits and perhaps err on the side of caution.