Engine, 3.0L V6, 181 cu in, multiport fuel injection (VIN L)

Years 1985–88 Models 2

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Also described as Engine, 3.0L (181 cu in) V6, multiport fuel injection

Also documented for Buick Pontiac

Documented applications

Calais — N-body (1985–1991)

1985–1988 Single-source

shared N-body code; cited from the Buick Somerset; optional Buick V6, 125 hp, with the automatic only (Wikipedia's Calais article); Wikipedia's Buick V6 engine article prints LN7 and VIN code L and lists the Calais for 1985–1988; gnttype.org's 1986 and 1987 Buick VIN tables print LN7 on the Somerset rows, sibling corroboration of the code (T3; it names the code on a Somerset, not a Calais, so it does not lift the row); its 1985 table repeats the 1986 table

Delta 88 — H-body (1986–1991)

1986 Single-source

125 hp, the standard engine; Wikipedia's Oldsmobile 88 article prints it in its engine table for 1986 only and says 1986 was the only year with the 3.0 L; the 1986 NICB manual prints a 3.0L V6 MFI engine with VIN letter L but no RPO codes (matched by meaning only); shared H-body code, but the Buick LeSabre sources add no second source (gnttype.org prints LN7 only for the Somerset)

This page aggregates every documented appearance of LN7 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.