By Jim Fitch
Practicing Oil Analysis Magazine
When a lubricant degrades, it forms reaction products that become insoluble and corrosive. So too, the original properties of lubricity and dispersancy can become impaired as the lubricant ages and additives deplete. Much has been published about the risks associated with overextended oil drains and the buildup of carbon insolubles from combustion blow-by.
However, surprisingly little has been said about the impact of fine abrasives in a lube oil as it relates to fuel economy over the engine’s life. One can imagine numerous scenarios in which solid abrasives suspended in the oil could diminish optimum energy performance.