“Eight hour radio tracer tests were conducted on a six cylinder internal
combustion engine to establish the relationship between wear rates and filtration
levels….”
“The wear rates were measured using radio tracer techniques, ie., the chrome
plated compression rings and standard bottoms rings were activated (made
radioactive) and the oil was surveyed for radioactive chromium, Cr 51 and Iron,
Fe 59.”
“Wear rates observed on the test with unfiltered used oil were 6 to 10 times
higher than wear rates with new oil, ie., 6 times higher on the oil rings and 10
times higher on the compression rings. When filtering through a 5 micron filter,
the wear remained almost unchanged, but 1 micron filtration significantly reduced
the wear by one-half on the oil-rings and one-fifth on the compression rings.”