I've been using it for about 40 years and swear by it. When I was doing gas conversions,(L.P.G & C.N.G.), I pulled down engines that had done extremely high mileage that had been on it since new and had no measurable wear. Works great in hydraulic systems too. An easy demonstration is add some of the oil stabiliser to a machine and measure before and after temperatures in operation. Nothing can fix a worn out engine but a rebuild but Morey's can get a lot more work out of it.
Someone mentioned it's now called Lucas, I don't know if this is true but Lucas and Morey's are both sold here.