How often to change Tranny fluid & filter - 2003 Mercury Grand Marquis

It depends on what he/she looks like.

Hi there,

I applaud you for asking this question, as this is the most neglected part of the vehicle.

Modern electronic transmissions are very sophisticated pieces of machinery, which require more care than we realise.

Although manufacturers recommend changing transmision fluid every 80 - 90,000miles, we have learned from experience that transmission fluids become contaminated and tend to break down much sooner than this.

Due to the extreme conditions imposed on the planetary gears, valves and solenoids, the only way to prolong the life of your transmission is to keep the fluid as clean as possible, and maintain the correct level.

So, my recommendations are:

- check the transmission fluid condition & level every month
- Flush the transmission every 30,000miles
- replace the transmission fluid + filter/s @ 30,000 miles (preferably the same time as a flush)

Note: NEVER overfill the transmission, as this can cause as much damage as underfilling. Use only trans fluid recommended by the manufacturer, as these fluids have special properties designed for this make of transmission.


Cheers,

Your vehicle is fairly new. You really don't have to worry about this right now honestly. However it is a good habit to do preventive maintainence. If you have your vehicle manual you will be able to find this info regarding manufacturer's specifications.

I have always changed mine in my crown vic every 60,000 miles