Hi. I'm about to start the 5th month of a 6 month extended oil change interval. Is there a starter dose of A-RX I can use now and the rest at the beginning of the 6th month?
Why don't you just finish out your 6 month interval first? Then put in some dino oil, a new filter, and a full 12oz bottle of rx, and then run it 500-1000 miles.