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Originally Posted By: White_Buffalo Ernest, keep in mind that the results on a UAO are not to be taken as exact measurements. You can easily see a 3-4 ppm difference in the results of the same oil sample run through the analysis twice. IIRC the test is reading the 4-7 micron range. Glad to...

I analyzed my UOA "ppm Iron" readings ...and below are 4 graphs which are mostly "self explanatory" ...if anyone's interested in more details I'll present and explain the equations and assumptions that were used to generate these graphs ...because analyzing diesel engines is my retirement hobby...

Originally Posted By: mikeshauling Ok i just got my first UOA back from Caterpillar. What do these #s mean??? 11,000 on truck 6,000 on the oil. Rotella15-40 ...2009 CTD 6.7 my 2nd oil change on the truck, 1st UOA. They didnt give me a TBN ? I am running an AMSOIL air filter since @ 500 miles...