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of time is off. It's been more like 20 years since the number and variety of synthetic oils have multiplied; the range and variability of available viscosities expanded; different types of detergents, anti-wear, and anti-shearing agents explored, etc. All coinciding with improved computer processing power, better microscopes, more data points for scientific research, etc... I'm not an oil expert, but it SEEMS like the science behind motor oil formulation has gotten better.
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