Some suggestions

his steely skin is covered by centuries of dust
once he was a great one, now he‘s dull and rust
an oily tear he‘s crying
can you feel the pain of the sad, sad robot
driving him insane
he can‘t turn back time nor history
so his life became a misery
he has to face his destiny
nobody cares anymore
sad, sad robot
sad, sad robot
he‘s a sad, sad robot
he‘s so alone
me steely skin is covered by centuries of dust
once me was a great one
but now i‘m dull and rust
an oily tear i‘m crying
can you feel me pain? i‘m the sad, sad robot
it‘s driving me insane
i can‘t turn back time nor history
so me life became a misery
i have to face me destiny
that i‘m all on me own
sad, sad robot
sad, sad robot
i‘m a sad, sad robot
i‘m so alone
red, red robot
red, red robot
i‘m a red, red robot
and so i shall return