It "should" last 2 tanks. Check your oil consumption after a couple hundred miles breakin. Not sure if Cat has fixed it, but both my '05 and '08 were really rich on oil, around 25:1. Measure ounces of oil vs oz gas (128oz/gal). I had to turn down the oil pump on both sleds. 3 turns on the M7 and 2 turns on the M1ooo to get the ratio to around 40:1.