A/T Fluid

Is there any reason to use, or NOT use the High Mileage A/T fluid when replacing the A/T filter at 100K miles.

What year? Trans design changed from the modulator vacuum pressure shifts after 1996, to PCS solenoid controls in 1997 (4T65E). Regardless, no harm done using High Milage fluid; better yet, why not use Dexron VI fluid?

2004 Limited.

2004 Limited.

Dexron VI is compatible with your car. I'm running it in mine which is a 2000 LeSabre.