Thread: I guess a newb question about trans fluid

GM started using Dex VI in 2006 model year cars; before that, they used Dexron III. If you want to convert pre-06 cars to Dex VI completely, you would need to take your car to someone who can do a completely fluid exchange. Otherwise, you can drop the pan, which will get ~60% of the fluid out, and refill with Dex VI. After a couple of times you've got mostly Dex VI. I do a pan drop every 30K mi.