Now, he could have just been giving me a story. I don't know. I'm not an engineer and I didn't research it. All I know is that I did use it and it did work for me whereas other oil additives did not work. A few helped just a little bit but the cars still smoked a lot (the very worst was STP Oil Treatment--that stuff would start clumping up in the oil pan after about 1,500 miles). Restore was the last product I used because it was so expensive compared to the other oil treatments. But once I tried it, I stuck with it because it worked so well in the cars.
And for everyone reading this thread, if the information I posted is wrong, then I do apologize. I certainly don't want to spread false information of any sort. But I did post originally to answer the question at the start of the thread and to share my experience with Restore and what I was told about it.
However, I should add that I knew that once the engines started blowing oil out the tailpipe that it needed to be rebuilt and that the Restore would only be a temporary measure. But I felt that if the engines could go another 9 months or so then it would be worth it. My dad's car ended up getting totaled a few years later (yeah, it did actually go for years) and the VW engine was totally rebuilt (with a big bore kit, carb, etc. too
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(aka talking out of my ass, which I happen to do more than I'd like). But from what I've seen and heard, the "microscopic metal filling in scratches and scores without affecting the rest of the engine" thing is more marketing than exact science (some products blatantly lie about how they work, but I'm not gonna go that far with Restore).
ok good i thought i was done for!