Oil rose to more than $80 a barrel on Tuesday as investors bought up risk assets after US data pointed to slowing inflation. The market was also buoyed by concern about supply disruptions, including the ongoing shutdown of the Canada-to-United States Keystone crude pipeline following a massive leak. Brent crude futures were up $2.85, or 3.4 per cent, to $80.84 a barrel by 1641 GMT. US West T