2008 Honda Goldwing Miles on Unit: 23,800 Miles on Oil: 9,400 Amsoil 10w-40 Amsoil Oil FIlter No Make-up Oil. 2 year (to the month) Oil Change interval. 4 Quart Sump Blackstone Comments: Two years? Psh! Piece of cake. Wear metals have continued to improve and there aren't any signs here that the oil is suffering, or breaking down due to the longer oil run. The viscosity was fine, the TBN was plenty strong at 4.6 and no fuel, water, or other contamination was found. We see no problems with an 11,000-mile oil run next time, if you're interested. Even if it takes three or four years, that should be just fine for this Honda. Nice report! ALUMINUM 12 CHROMIUM 1 IRON 22 COPPER 19 LEAD 1 TIN 0 MOLYBDENUM 51 NICKEL 1 MANGANESE 2 SILVER 0 TITANIUM 0 POTASSIUM 4 BORON 11 SILICON 13 SODIUM 5 CALCIUM 3245 MAGNESIUM 57 PHOSPHORUS 1139 ZINC 1345 BARIUM 1 SUS Viscosity @ 210°F 75.7 cSt Viscosity @ 100°C 14.43 Flashpoint in °F 395 Fuel % 0.5 Antifreeze % 0.0 Water % 0.0 Insolubles % 0.2 TBN 4.6 TAN ISO Code Refilled with Mobil 1 Motorcycle 4T 10w-40 (9.99/qt at Wal-Mart), and a Mobil 1 M-108 filter. I'm no longer an Amsoil dealer, since they screwed with the way commision is paid. Great oil though. I just think there are other oils out there that can go for long OCIs as well. Plan on going another 2 years/ 12-13k as soon as I can get a comparison on how this Mobil 1 stacks up with the Amsoil with a VOA. What do you guys think? Is this Mobil 1 as good as the Amsoil?