Hi Jerry: The MiniLite statement has nothing to do with the condition nor safety of now 40+ year old magnesium wheels. Yes, it is still a winning "design". Yes, when first cast magnesium wheels are light weight and very strong. Most magnesium wheels are stamped or cast with their Date of Manufacture - there is a reason for that, and it is important to pay attention to it. Magnesium wheels are designed to meet a specified duty cycle and service life. What metals are alloyed with the magnesium, how the wheel is cast and or forged and machined, how the wheel is designed structurally all play a role in meeting the pre-defined duty cycle and service life requirements. If I had to guess, I would guess that the Minilite's you have and the American Racing Wheels that I have - were designed for competition use over a period of 5 full seasons or less. I would be interesting to see what warning labels if any, came on them when they were new. I did quite a bit of research when I was attempting to restore a set of American Racing Le Mans wheels for my BRE Z. Most of the information I trusted came from the guys in the Materials Lab where I worked. So take if for what it is worth. Magnesium hardens with age and it thus becomes more brittle over time. Within a defined high load impact a new magnesium wheel will actually flex or deform without failing {about three times as much as aluminum}. That same wheel twenty years later, given the same level of impact, may fracture, and that can cause a sudden and unexpected failure.. Then there are variables among/between different qualities of magnesium wheels. Cast or Forged there can be small voids in the original structures, and within these voids there can be corrosion taking place over time, which in turn can cause deep pitting. [the magnesium alloy billets used for Forged wheels can have the same problems as any castings - it is all about process control}. Magnesium wheels are porous - as anyone that runs them knows - they have to be coated to seal them, at least on the tire mounting surfaces to hold air for very long. They are also subject to rapid oxidation and corrosion when exposed to moisture. So moisture and air can penetrate deep into the metal. As the magnesium wheel ages, these corrosion pits both external and internal to wheel, can develop into fractures in the metal {somewhat like a chip in a windshield can develop into a crack}. While eddy current inspection can help identify these microscopic fractures on the external surface before they develop farther, it takes X-Ray inspection to find potential problems within the metal. All that said - I do have a set of 40+ year old mag's on the BRE Baja Z. They are there just for show, to roll the car on and off the trailer. I had them inspected {NDI Tech at the local Air Port Service Center} and picked the best 4 out of 8 wheels. Crazy as it may seem - I have driven the car at highway speeds on them as well - but I am well aware of their limits and the risk I am taking. I certainly would not do any of that on 40+ year old mags without having them professionally inspected, and found to be at least currently "solid". Nor would I sell any 40 year old magnesium wheels to anyone for other than "display" use. FWIW, Carl B.