after i get in to 40mph its start shaking very hard like it loose strong on 2005 Chevrolet Equinox

i have to put motor oil between every 3 months change because it burn it and its using a lot of gasoline, i think it most be something electronic but i am not sure

Asked by for the 2005 Chevrolet Equinox
any check engine lights? diagnose this first.and with the burning of oil could be a mechanical problem ring or valve train