'02 Honda 3.0L V6 4-speed automatic Mainly city-driven. Top speed a few times after 10k miles on car. Other than that driven by wife. Sample taken Mar-13-2004 Blackstone Labs Sample/Universal averages TAN - 0.4 (high?) Aluminum - 26/22 Chromium - 1/1 Iron - 59/111 Copper - 9/58 Lead - 1/10 Tin - 1/1 Molybdenum - 0/1 Nickel - 0/0 Manganese - 0/1 Silver - 0/0 Titanium - 0/0 Potassium - 0/0 Boron - 222/159 Silicon - 11/14 Sodium - 9/14 Calcium - 334/459 Magnesium - 208/103 Phosphorus - 3/160 Zinc - 242/256 Barium - 4/4 SUS viscosity - 45.0/(43-51) Flashpoint = 355°F Water = 0.0 Insolubles = 0.0 Blackstone said aluminum was high - probably from manufacture. This was based on iron was half of universal average so aluminum should have been half as well. Anyone know what might be up with the phosphorus? Fluid was drained (1st time) at this sample. Refilled with 3 quarts of Honda ATF-Z1. It will be changed again in 10k miles due to Honda transmission problems (cheap insurance @ $3.25/qt). This was my first sample with Blackstone Labs. Good first impression - very professional. They answered my emails w/in 1 day. I mailed the package on 3/15 from Alabama & received my results via fax & email 3/22. $30 for test + TAN. Is TAN a waste or should I be getting a TBN or neither? Thanks for any input.