However, a generally accepted guideline for automatic transmissions in vehicles of that era is every 30,000 to 60,000 miles under normal driving conditions. If you frequently drive in stop-and-go traffic, tow heavy loads, or live in an extremely hot or cold climate, you should consider a shorter interval (closer to 30,000 miles). For severe driving conditions, some experts might even suggest an interval as short as 15,000-20,000 miles.
Crucially: Since your car is older, it's likely that the transmission fluid hasn't been changed in a very long time. If you don't know the history of the transmission fluid changes, it's advisable to have it changed sooner rather than later, even if it's beyond the typical mileage recommendations. Ignoring this can lead to premature transmission wear and costly repairs.
Consider a professional inspection: It would be wise to have a mechanic inspect the transmission fluid. They can assess its condition (color, smell, presence of debris) and advise you on the optimal time for a fluid change or flush. They can also check the transmission's overall health.
