Second Generation 1980-1985
For the 1980 model year, Cadillac moved the Seville to the 114 in (2,900 mm) wheelbase K-body, based on the front-wheel drive E-body Eldorado, Buick Riviera and Oldsmobile Toronado. Returning to some of the original concepts floated for the 1975 edition (the March 2008 issue of Collectible Automobile featured an early concept of what evolved into the downsized 1977 Cadillac DeVilles and Fleetwoods — one of the concepts which was withdrawn looks similar to the second-generation Seville), The rear styling was intended to invoke the look of Daimlers of a past era (though British Leyland were building cars with this feature even then). In the US, The bustle-back styling was imitated by the 1982–1987 Lincoln Continental sedan, and the 1981–1983 Chrysler Imperial coupe.
The new model, one of the last vehicles designed by GM's Bill Mitchell, featured front-wheel drive and independent rear suspension. The Seville initiated features that would become more traditional in later years. In 1981, "memory seats" — a feature not seen on a Cadillac since the Eldorado Broughams of the late 50's — became available again. This option allowed two memorized positions to be recalled at the touch of a button. Also for 1981 was a digital instrument cluster. The "Cadillac Trip Computer" was a precursor to this option in 1979. For the '81-'85 Seville and Eldorado, it was considerably less expensive, at US$200 in '81, and did not contain the many features of Trip Computer, just a digital speedometer and fuel gauge. "Puncture-sealing" tires were also new for '81. In 1982, Seville offered heated outside rear-view mirrors with the rear defogger option. Inside, a "Symphony Sound" stereo tape system was available. For 1983, a new "Delco/Bose" stereo cassette system was offered at US$895. Initially looking like a standard Delco radio in 1983, from 1984 on it featured a brushed gold-look front panel and bulbous lower interior door speaker assemblies. This was also the last year for the availability of an 8-track stereo system for Seville. On the outside, from 1983 through 1985, Seville was available with a "Full Cabriolet Roof" treatment option, which gave Seville the look of a four-door convertible. Cadillac offered a roof treatment like this on their 1978 "Phaeton" Coupe and Sedan de Ville models two years earlier.
In hip hop culture, this generation of Sevilles were known as "slantbacks." Sales were respectable at first, but disastrous experimentation with diesel engines (an Oldsmobile-sourced 5.7 V8, plagued with head gasket problems) and the ill-fated 1981 V8-6-4 variable displacement engine (1980s technology could not make it work reliably), along with poor quality control and lackluster performance from engines severely detuned to meet more stringent CAFE standards, began to erode the Seville's standing in the marketplace. A new but underpowered 4.1 liter V8 was fitted to post-1981 models. It was prone to the block becoming porous and coolant mixing with the oil, resulting in catastrophic engine failure. Some 1981-1982 models were also fitted with an optional 4.1 liter Buick V6, which was a reliable enough engine, but was not powerful enough for the Seville's weight and performance was lacking.