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DONT USE IT. I put some in my '84 F250 351 and shortly thereafter replaced TWO oil pumps and eventually the engine. The engine was worked hard plowing snow and stuff, but I'm 90 percent sure thr oil pump failures were a direct result of using ' Engine Restore'. Like the others said- snake oil.
I've used it in some pretty tired equipment here on the farm. In some instances, it reduced oil consumption and smoking. No issues with engines going south as a result.
I would not consider it for anything that wasn't on it's last legs. The cheapest insurance that I've found is to use very high quality oil, and keep it changed (per oil analysis recommendations).
Personally I prefer Lubrication Engineers products and Valvoline synthetic oil.