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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...