my local napa store give me a free report and just got it back.it was done at wixfilters atlanta ga.its a 1993 with 139678 miles F700 dump truck 5.9 cumminsthe oil is rotellat 15w40 has 7500 miles and no make up or additives.iron28,chromium5,lead3,copper2,tin0,aluminum4,nickle0.silver0.silicon5,boron8,sodium38,magnesium21,calcium2798,barium0,phosphorus1287,zinc1536,molybdenum3,titanium0,vandi um0,potasium23, fuel<1,vis@100c 14.58.water0,soot\solids0.3,coolant no.tbn9.4.no corrective action required.so what do you think?first time ive ever had it done.bought the truck new and always changed oil every 7500 miles