Technical Service Bulletin: Correlation between particle size and engine wear.
"SAE Testing In the 1988 Correlating Lube Oil Filtration Efficiencies With Engine Wear technical paper published by the Society of Automotive Engineers (SAE), the relationship between filtration levels and abrasive engine wear was established. Testing determined that wear was reduced by as much as 70 percent by switching from a 40μ filter to a 15μ filter. The SAE conducted tests on a heavy-duty diesel engine and an automotive gasoline engine, and both provided consistent results."
The SAE paper summarizes the test results with the following conclusions:
“Abrasive engine wear can be substantially reduced with an increase in filter single pass efficiency. Compared to a 40μ filter, engine wear was reduced by 50% with 30μ filtration. Likewise, wear was reduced by 70% with 15μ filtration. “Controlling the abrasive contaminants in the range of 2 to 22μ in the lube oil is necessary for controlling engine wear. “The micron rating of a filter, as established in a single pass efficiency type test, does an excellent job in indicating the filter’s ability to remove abrasive particles in the engine lube oil system.”
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