Can you use this fluid in any transmission ? I have a 2003 Buick LeSabre with 117,000 miles with common hard shift problem not too bad and not all the time was told its a solenoid problem.

You might want to consider Lubegard "Red". It was recommended to me many years ago by a reputable transmission shop. I've used it in every transmission since with no ill effects and hopefully beneficial. If you solenoid is sticking, and not a mechanical issue, it might help.