Engine, 3800 3.8L V6, multiport fuel injection

Years 1990–95 Models 4

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Also described as Engine, 3.8 L V6, Buick 3800Engine, 3.8L V6, sequential fuel injection

Also documented for Chevrolet Oldsmobile Pontiac

Documented applications

Park Avenue — C-body (1991–1996)

1991–1994 Single-source

the naturally aspirated 3800 Series I, 170 hp, the base engine; every year from Wikipedia's Park Avenue infobox and its Buick V6 article, which both give L27 to the Park Avenue for 1991–1994 (the V6 article calls the induction tuned port injection); shared C-body engine: the Oldsmobile 98 article's infobox and the V6 article's 1992–1994 Ninety Eight entry name it for the sibling, but both are Wikipedia, so the row stays single-source; the description follows the merged regal-w-body-1988 doc

Reatta — E-body derivative (1988–1991)

1991 Confirmed

Wikipedia's infobox and text give the L27 for 1991, replacing the LN3; the Reatta Owners Journal prints "L27 - 3800 engine" on its Reatta service-code list (two sources agree on the code; Wikipedia dates the year)

Regal — W-body (1988–1996)

1990–1995 Single-source

the 3800 Series I, optional from mid-1990; 170 hp; Wikipedia's Regal engine list and its Buick V6 article give L27 to the Regal for 1990–1995 (Wikipedia calls the induction tuned port injection); the Lumina never offered it, so no kit page applies

Riviera — E-body (1986–1993)

1991–1993 Single-source

Wikipedia's Riviera article says the last three model years used the L27, and its Buick V6 article lists the 1991–1993 Riviera under L27; the two articles are one source; matched to the car by meaning; decoderpo.com's GM-wide dictionary reads L27 as the 3.8L V6 sequential fuel injection engine but names no vehicle

This page aggregates every documented appearance of L27 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.