Yea, right. And the oil companies killed the 200 mpg carburetor back in the 1950's. They could make a 100K tire, but it would be harder rubber without good traction.
Hahaha, I've heard this story about the fabled magic carburetor, the perfect lossless combustion engine, the lightbulb that never dies, etc. etc. over the years too.
It's always told by somebody who's uncle lived in the same small town as the guy who invented it and was bought out, and it's always completely
legitimate (trust me, bro!). And there's always some unknown sneaky bastard from a large, evil, company who bought them out and signed them to secrecy, never allowing the product to be made.
Is it possible that one or to these could be true, to a certain extent? Naturally. Is it also highly unlikely? Absolutely, for a number of reasons. If you're interested, take a look at the carnot cycle/engine, it's a neat theoretical description of a perfect cycle, and explains why it's not possible.
There are plenty of greedy people and even more shady companies out there, I can't argue with that. But there are also plenty of extremely intelligent people out there and companies pushing the boundaries of science and technology everyday. If one person can come up with it, another person will as well. A miraculous invention like any of those above will be a game changing one, and won't be kept under wraps for long.
Back to the oil question though, one thing I have noticed with their responses above is that nobody pointed out that you will also want to consider where you live and the types of temperatures/work the motor will see. I'm a Mobile 1 synthetic guy for most of my adult life like the gentleman above, and have never had a problem with it. Some of the best and most expensive cars on the planet run it, so it's always been good enough for my humble whips. As for viscosity (the two numbers you see listed for each oil have to do with the viscosity at low temperatures and high temperatures), I just go with whatever the dealership recommends in the area of the country I'm living in.