Can I add a 16 oz can of Trans Tune to a full transmission 1998 Lincoln Navigator, or do I remove some fluid? [SOLVED]

Thanks for the question!

As long as the transmission is not already overfilled, you can add the full 16 oz can directly to the transmission and you don’t have to drain any fluid. It will work to clean sticky residues and condition the transmission fluid for the life of the fluid.

If you’re using it as a pre-flush before changing the fluid, make sure to drive the vehicle for at least 30 miles to circulate the Trans Tune through the system.

Hope that helps and let me know if you have any other questions!

Best,
Conner
Sea Foam