Amsoil 10W-40 MCF in a 2004 Yamaha YZ250F. Drained the oil with ~5 hours on the oil and 120 miles. The sample is from September 2005
Testing was done by Blackstone Labs 02/21/06
INSOLUBLES 0.2%
WATER 0.0%
ANTIFREEZE 0.0%
FUEL FLASHPOINT DEG F 420
SUS VISCOSITY @ 210 DEG F: 64.1
ALUMINUM 14
CHROMIUM 1
IRON 7
COPPER 3
LEAD 0
TIN 1
MOLYBDENUM 38
NICKEL 4
MANGANESE 0
SILVER 0
TITANIUM 0
POTASSIUM 1
BORON 3
SILICON 10
SODIUM 0
CALCIUM 3243
MAGNESIUM 23
PHOSPHORUS 1171
ZINC 1343
BARIUM 0
COMMENTS BY BLACKSTONE, EDIT: MY HANDWRITING SUCKS IGNORE THE YX250F REMARK!
Another first for us -- The Yamaha YX250F. But we have seen many other Yamahas, so we based wear in the universal average file on a similar type. Your wear is better than average, which is a good sign that this Yamaha engine is doing just fine. The TBN of this sample read 11.8, so the oil was loaded with active additive. The oil was in good shape physically, containing no moisture, fuel, or other contaminants. The viscosity was just a little low, but it's not hurting anything. You could run more miles on the oil if you wanted. Nice engine!
Testing was done by Blackstone Labs 02/21/06
INSOLUBLES 0.2%
WATER 0.0%
ANTIFREEZE 0.0%
FUEL FLASHPOINT DEG F 420
SUS VISCOSITY @ 210 DEG F: 64.1
ALUMINUM 14
CHROMIUM 1
IRON 7
COPPER 3
LEAD 0
TIN 1
MOLYBDENUM 38
NICKEL 4
MANGANESE 0
SILVER 0
TITANIUM 0
POTASSIUM 1
BORON 3
SILICON 10
SODIUM 0
CALCIUM 3243
MAGNESIUM 23
PHOSPHORUS 1171
ZINC 1343
BARIUM 0
COMMENTS BY BLACKSTONE, EDIT: MY HANDWRITING SUCKS IGNORE THE YX250F REMARK!
Another first for us -- The Yamaha YX250F. But we have seen many other Yamahas, so we based wear in the universal average file on a similar type. Your wear is better than average, which is a good sign that this Yamaha engine is doing just fine. The TBN of this sample read 11.8, so the oil was loaded with active additive. The oil was in good shape physically, containing no moisture, fuel, or other contaminants. The viscosity was just a little low, but it's not hurting anything. You could run more miles on the oil if you wanted. Nice engine!
