Change the date range on the search criteria to newer than 5 years. You'll find several listings.
The bottom line is that just about nothing, including MotorSILK improves the best product the oil company chemists put out for a given price point. If you want better oil, buy better oil. Don't try to home-brew and expect a better product than those chemists can concoct for the same total price.
There are a few exceptions. LC20 is volatile and must be replenished every 1000 miles. It works well, but takes more attention than most consumers want to bother with. Auto-Rx is different--a truly effective cleaner--and is too costly for the oil companies to put into their products.
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Rooster today;
Feather duster tomorrow.