I had my transmission Serviced at 50,000 miles on my '04 Nissan Xterra.
That was a couple years ago before I bought a house and I now do the vast majority of work myself.
I have noticed for awhile that the shifts from the auto transmission on the Xterra are nowhere as smooth as on my Ford Taurus or Ford F-150.
I added the reccommended doseage of LC20 a week ago, 1 fluid oz, and have noticed a difference.
Although it is still not as smooth as my Taurus or F-150, it is not as harsh as it was. I didn't expect the results I got from 1 fluid oz, however I have noticed a difference.