Just change your fluid with a good synthetic and add a pint of red Lubegard and call it a day. By the way I see people on here changing their fluid after 30,000 [censored]? Total waste of money...if you run synthetic every 100,000 miles is fine, conventional should be changed every 50,000. This is for normal driving and operating temperatures though. If your towing, racing or other severe duty conditions I would change it sooner. My 1988 Suburban has 286,000 miles 1/2 of them are towing campers and boats. Tranny fluid changed every 75,000 miles with synthetic and one pint of Lubegard red...it still works like it did the day it was bought in 1988! 30,000 miles is like changing your oil every 1500 miles!