I was looking around and found this document: http://www.nrel.gov/docs/fy06osti/38509.pdf
It was an analysis of a test of running trucks on biodiesel fuel. Now on pages 5-9, they have an analysis of engines from 4 Mack trucks that were part of the test, including results from UOAs from those 4 engines, on page 7. Unfortunately, the article didn’t include UOA results from the Ford engines. The 4 mack engines put on a combined total of some 750,000 miles before the teardown.
I’d like to verify that I understand their comments accurately. It appears to me that they are saying that the 4 Mack truck engines were roughly the same in terms of engine wear. The report says that “no significant differences were found” in some of the engine parts. Now on page 7, they produce UOA results (which are evidently from the 4 Mack engines). I see that iron levels vary from 13 ppm to 43 ppm.
Unfortunately, analyzing used oil analysis was not the purpose of the test. The test does not provide much information about the UOA results given. The second to the last paragraph on page 6 suggests that this UOA was done at the end of the test period, after the mileage was put on.
Looking at these numbers, can we conclude that differences in UOAs from 13 to 43 ppm of iron really are nothing to worry about? In other words, that results that vary that much, can still come from engines that show the same amount of wear?
It was an analysis of a test of running trucks on biodiesel fuel. Now on pages 5-9, they have an analysis of engines from 4 Mack trucks that were part of the test, including results from UOAs from those 4 engines, on page 7. Unfortunately, the article didn’t include UOA results from the Ford engines. The 4 mack engines put on a combined total of some 750,000 miles before the teardown.
I’d like to verify that I understand their comments accurately. It appears to me that they are saying that the 4 Mack truck engines were roughly the same in terms of engine wear. The report says that “no significant differences were found” in some of the engine parts. Now on page 7, they produce UOA results (which are evidently from the 4 Mack engines). I see that iron levels vary from 13 ppm to 43 ppm.
Unfortunately, analyzing used oil analysis was not the purpose of the test. The test does not provide much information about the UOA results given. The second to the last paragraph on page 6 suggests that this UOA was done at the end of the test period, after the mileage was put on.
Looking at these numbers, can we conclude that differences in UOAs from 13 to 43 ppm of iron really are nothing to worry about? In other words, that results that vary that much, can still come from engines that show the same amount of wear?