Even though the mileage is low (30,000 miles) for a 2004 vehicle,
it's generally recommended to change the transmission fluid in the 2004 Lincoln Town Car regardless of the mileage. The fluid degrades over time, not just due to mileage. The age of the fluid (nearly 20 years old) is a more significant factor than the low mileage. Old transmission fluid can become contaminated and cause damage to the transmission.
Therefore, instead of waiting until 60,000 miles, have the transmission fluid and filter changed now. This is a preventative maintenance step that could save you a costly transmission repair down the road.
