In 1966, changes included a somewhat coarser mesh for the radiator grille insert, which was now divided by a thick, bright metal horizontal center bar housing rectangular parking lamps at the outer ends.
Separate rectangular side marker lamps replaced the integral grille extension designs. There was generally less chrome on all Cadillac models this year.
Cadillac crests and V-shaped moldings, front and rear, were identifiers. Cadillac "firsts" this season included variable ratio steering and optional front seats with carbon cloth heating pads built into the cushions and seatbacks.