Lower-Viscosity Motor Oils

Growing up my father owned a service station and I can remember from a very young age that the most popular oil was 10W-40. At the time, I didn’t even know what those numbers meant. I simply sold the oil that people wanted and left it at that. But as I grew older I came to realize that those numbers meant so much more. Let’s take a brief look at this. What is viscosity? In layman’s term, the viscosity is the liquids resistance to flow. It is a lubricant’s most important property.  The viscosity must be high enough to maintain a lubricating film, but low enough …

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