Cadillac enjoyed its first 200,000-car year for calendar '66, breaking the barrier by precisely 5001 units. A mild facelift brought a new front bumper and grille, plus more integrated taillight housings. The 75 switched to the new perimeter frame and was fully restyled for the first time since 1959. Variable-ratio power steering was a new option, as were carbon-cloth seat heating pads. The Fleetwood Brougham became a separate model, still more luxuriously trimmed than the plain-roof Sixty Special and priced about $320 higher.
| Vehicle numbers were found on the left center pillar post. |
| The original engine serial number was the same as the vehicle identification number. |
| The numbering system was the same employed a year earlier with the second symbol changed to a "6" for 1966 model year. |
| All Eldorados now utilized the first two symbols "68" for their Style Number. |
| The Sixty-Special Brougham was now a separate model of the Fleetwood Series with a "P" Style Number suffix applied. |
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