Engine, 3.8L V6, 231 cu in, 2 barrel

Years 1977–87 Models 5 Factory citations 4

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Also described as 3.8L (231) V6 2-bbl3.8L (231) V6 2-bbl, naturally aspirated (105 hp)Engine, 3.8L V6, 231 cu in

Also documented for Chevrolet GMC Oldsmobile Pontiac

Documented applications

Full-Size — LeSabre / Electra / Wildcat

1977–1982 Confirmed

LeSabre

Regal / Century

1978–1982 Confirmed

Regal, Century to 1981 (std.)

LeSabre — B-body (1983–1985)

1983–1985 Single-source

the standard engine of the coupe and sedan (VIN code A); Wikipedia's LeSabre article names the 231 V6 in each of these years but prints no code, so the code is matched to the car by meaning; gnttype.org's 1984 and 1985 Buick VIN tables print it for the LeSabre Custom and Limited; 1984 rests on those two non-kit sources (the 1984 kit's LD5 page has no readable model year, and its dated page names LD5 only beside LC3); shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1983 Chevrolet Caprice, p.17.
GM Heritage factory kit — 1985 Chevrolet Caprice, p.40.

Regal — G-body (1983–1987)

1983–1987 Factory-verified

the base engine; not with WE2 (1987); every year from gnttype.org's VIN engine tables, 1987 also from its option sheet; shared G-body powertrain code, cited from the Monte Carlo kit (1983–1984)

GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.
GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.

Riviera — E-body (1983–1985)

1983–1985 Single-source

Wikipedia's Buick V6 engine article gives LD5 as the code of the 231 and lists the Riviera S-Type, T-Type and convertible for 1979–1985 under that section, which covers the turbocharged engine as well as the plain one; its Riviera article names the 231 and the turbocharged 231 for the generation; no Riviera source ties the code to the plain or the turbocharged engine, and gnttype.org's Riviera blocks do not print it; matched to the car by meaning

This page aggregates every documented appearance of LD5 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.