I remember my first direct experience with one of the early oil additives that also promised great and wonderful things, and you may have heard of that one. It was called STP. In a fuels and lubricants class we did a little experiment with that product that showed why believing the ads and just throwing additives into your motor oil might not be a great idea. We took a measured amount of motor oil in a beaker, checked the viscosity at the standard temps of 0°C and 100°C, then added the STP in the ratio called for on the can, and tried to run the viscosity tests again. At 100°C the thickening agents did in fact increase viscosity as you would expect. At 0°C we were unable to run a viscosity test, since the oil/STP mixture had turned into a lump that wouldn't flow at all. As we cooled the mixture in an ice bath while stirring, we reached a point where we could no longer stir the mixture, and we could pick the beaker up with the stirring rod. Guess how great that would work in your car on a cold winter morning.
My point is that unless you're a scientist with a very good understanding of the chemistry and the requirements and operating conditions, it's probably better to leave the blending of your motor oil to the experts. If this or any other additive was really even half as good as the adds claim, I'm quite certain at least one or two of the motor oil companies would incorporate it in their product from the git-go, since the business is rather competitive. Other companies that offer similar snake oil have been successfully sued over the years for false advertising, like Slick 50 for instance, and I wouldn't be surprised if this Motorkote product becomes popular enough to come to the attention of the FTC that it wouldn't be another pelt added to the belt of an FTC lawyer.
Jerry
Wow. Best post ever!

Well, not really. It's the most logical, well thought out, reasonable and helpful post ever on a forum. Because if everyone evaluated products as Jerry did here we'd have a lot stupid eliminated pretty quick. Some other areas could use that kind of thought too.
But lets face it... It can't really be the best post. None of us can ever out pithy Don.

It has to pithier to be best. And Jim got be King of England. Getting to be king might help. To tell the truth from the hair regrown, knives returned, boobs enhanced, presidents elected, and balls batted (Bonds, not masturbation...sheesh) you guys have spouted more miracles caused by snake oil then I've heard since Catholic School. (Other than the OPs stuff of course). So they might have to be the more bestest too.
OK, seriously. Thanks Jerry! We really need more people who think that way.