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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    Source document

    docs/rpo/cadillac/deville-c-body-fwd.md

    Interactive view →

    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive DeVille — C-body front-drive (1985–1993) page.

    Cadillac DeVille — C-body, front-drive (sixth generation) (1985–1993)

    The sixth-generation DeVille was Cadillac's front-drive C-body car for the 1985–1993 model years, sold as the Coupe de Ville and Sedan de Ville (Wikipedia); the NICB VIN manuals print "DeVille (FWD)" for 1985, "DeVille Coupe" and "DeVille Sedan" for 1986–1989, "DeVille" for 1990–1993 and "DeVille Touring" in 1993, with symbol CD. No GM order guide, data book, Heritage kit or service RPO list for this DeVille is in the archive, so only three engine codes are listed, each from Wikipedia's DeVille and Cadillac engine articles: the 4.1L HT-4100 V8 (LT8), the optional 1985 diesel V6 (LS2) and the 1991 4.9L V8 (L26). The 4.5L V8 of 1988–1990, the THM 440-T4 automatic transmission and every option, package, paint and trim code have no source that ties a code to this car with a year, so none is listed.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    LT8 Engine, 4.1L V8, throttle body fuel injection 1985–1987 the standard HT-4100 (High Technology) V8, 135 hp; Wikipedia's High Technology engine article gives the option code LT8 to the HT-4100 and lists the DeVille among its applications for every year of this span, and its DeVille article calls the HT-4100 the standard engine of the 1985 sixth generation, continuing in 1986; the article's applications list ends the HT-4100 after 1987, and the 4.5L that replaced it for 1988 gives no code in any source read; both articles are Wikipedia, one source; decoderpo.com (T3, undated, no vehicle) reads LT8 as a 4.1L V8 engine, which agrees on the meaning only; the code is not listed in a Cadillac-specific factory page, so single-source single-source
    LS2 Engine, diesel, 4.3L V6, 263 cu in 1985 optional, 85 hp; Wikipedia's Oldsmobile diesel article lists the 1985 Cadillac de Ville among the front-drive LS2's applications (with the Buick Electra, Cadillac Fleetwood and Oldsmobile Ninety-Eight, which share the engine on the same platform), and its DeVille article says the diesel was optional for 1985 and dropped the following year; decoderpo.com's LS2 entry reads as a 6.0L V8, a different meaning, so it gives no support; single-source single-source
    L26 Engine, 4.9L V8, multiport fuel injection 1991–1993 200 hp; Wikipedia's High Technology engine article heads the 4.9 section with the code L26 and lists the DeVille among its applications for every year of this span, and its DeVille article introduces the 4.9L for 1991; decoderpo.com (T3, undated, no vehicle) reads L26 as a 4.9L V8 with multiport fuel injection, which agrees on the meaning only; both articles are Wikipedia, one source single-source

    Sources

    Factory documents (T1)

    No Cadillac factory document for the 1985–1993 DeVille is in docs/factory-docs/ or docs/heritage-ocr/, and the brief lists no Chevrolet twin kit, so no row carries an [FD] or [HK] citation.

    Other sources

    • https://en.wikipedia.org/wiki/Cadillac_de_Ville_series — sixth generation (1985–1993): bodies, engines by year, 1986 Touring trims, 1985 diesel (retrieved 2026-11-05 as wikitext, action=raw; en.wikipedia.org/wiki/Cadillac_DeVille is a redirect to this article)
    • https://en.wikipedia.org/wiki/Cadillac_High_Technology_engine — HT-4100 option code LT8 and its DeVille applications; L26 4.9 heading and DeVille applications; 4.5L (no DeVille code) (retrieved 2026-11-05 as wikitext)
    • https://en.wikipedia.org/wiki/Oldsmobile_Diesel_engine — LS2 4.3L V6 diesel, front-drive, 1985 Cadillac de Ville (retrieved 2026-11-05 as wikitext)
    • https://decoderpo.com/pages/L/T, https://decoderpo.com/pages/L/2 and https://decoderpo.com/pages/L/S — GM-wide code dictionary (T3), undated and without vehicle or year; corroborates only the meaning of LT8 and L26, and prints LS2 with a different meaning (retrieved 2026-11-05)
    • NICB Passenger Vehicle Identification Manual, GM sections (T4): docs/reference/nicb/nicb1985-gm.txt p.29, nicb1986-gm.txt p.39, nicb1987-gm.txt p.40, nicb1988-gm.txt p.40, nicb1989-gm.txt p.41, nicb1990-gm.txt p.37, nicb1991-gm.txt p.36, nicb1992-gm.txt p.39, nicb1993-gm.txt p.38, read as text — DeVille series names, symbol CD and, in 1993, "DeVille Touring"; its engine tables name no car line and no RPO code