Never heard of an engine ruined by ARX. Or by MMO for that matter.
As for directions for ARX.
I still have a bottle and a half of what I bought 5-6 years ago.
1: Add one bottle of Auto-Rx to your existing oil. Change oil filter only.
2: Drive 1,500 miles, then change oil and filter.
3: Drive 2,000 miles with just your new oil.
4: Repeat processs if vehicle has over 100,000 miles.
5: For complete application instructions visit
www.auto-rx.com
So, if my exsisting oil is M1 0w-40, I can add it, per #1.
Other additives I've used, MMO, Restore, Rislone, for example, tell me everything I need to know right on the bottle. No need to visit a site.
Now, I know that said instructions are no longer valid, but there you are.
For purpose of disclosure, I'm about 600 miles into a clean phase. (No, I'm not using 0w-40, but Castrol 5w-40.)
After 2K miles, I'll pull the filter, put it side by side with the last one, which was used for 2K miles of an MMO treatment, and post a pic of them.
I intend to run 8K clean, followed by 8K rinse.