Sudden heavy oil use

Had 6k service about a month ago. 2k since then with no oil use. Then suddenly using the semi-synth like its going out of fashion. No apparent oil leak - any suggestions?

hi are you sure its drinking so much ,take 3 or 4 readings first before you decide. the level can go up and down by 1/2 to 3/4 of the site glass ,if the readings wrong it will give a lesser reading rather than more . dont put to much oil in as it can blow seals or site glass out good luck have fun hope bikes ok if not back to the dealer