I have a 98 GTP with 198k on it. I have no idea when or if the trans fluid has been changed. It looks very clear to me like too clear IMO. Anyways I am wanting to do a pan drop/drain and a filter change and I'm not sure if I should go with Dexron VI or if I'll be ok with Dexron III. I know they are backwards compatible but I wasnt sure if itll mess anything up if the previous owner put VI in it and I put III in. The cheapest I could find VI for is 40 dollars and thats using walmart brand fluid.