Texaco Havoline 10w40 in a 2006 Yamaha YZ250F. 4.5 hours on oil, 5.4 hours on bike. Testing done by Blackstone Labs 1/6/06. INSOLUBLES: .3% WATER: 0.0% ANTIFREEZE: 0.0% FUEL: 0.5% FLASHPOINT IN F: 370 SUS VISCOSITY @ 210 F: 58.3 ALUMINUM 24 CHROMIUM 1 IRON 17 COPPER 18 LEAD 606 TIN 4 MOLYBDENUM 70 NICKEL 2 MANGANESE 1 SILVER 5 TITANIUM 0 POTASSIUM 3 BORON 128 SILICON 24 SODIUM 3 CALCIUM 1844 MAGNESIUM 37 PHOSPHORUS 813 ZINC 887 BARIUM 9 this report has me REALLY scratching my head. while i do have some fuel (turns out to be a overly high set float) some of the other elements are just beyond me. silver 5??? magnesium 37? barium 9??? the lead is from race fuel. this was the 1st oil change and put in at 0.9 hours and dropped at 5.4 hours. maybe the results are from the oem oil and still what was left from breakin? i'll run 2 more filter changes and then re-test. p.s. it seems the *new* mixmaster of doom turned this highly regarded oil into wizz weight in no time at all.