I had an unopened bottle of Auto-RX that I purchased in late 2006 or early 2007.
I just used it to run a clean phase of 1500 miles (1520 to be exact) in my new 2008 Elantra with 29K. The original owner did a lot of short trips to the train station so I wanted to clean up any possible deposits. I changed the oil on Wednesday and headed out on a 700 mile round trip to visit an upstate college with my daughter.
I now realize that I could have ran the clean phase 700 miles longer as A-RX has changed their instructions since the label was printed.
At any rate I did 700 miles in 2 days at highway speeds in the 70's (touching 80 a few times). I would think that this should be a very good way to do the rinse phase.
Did Auto-RX change their instructions because 1500 miles wasn't long enough for the cleaning phase? I'm hoping that the 1520 miles was enough for a good cleaning phase.
The slight discoloration that was on the dipstick is now gone.
PS: I used PYB for both cleaning and rinse.