Engine, 2.5L L4, 151 cu in, throttle-body fuel injection (VIN U)

Years 1986–91 Models 2

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Also described as 2.5 L L4, throttle-body fuel injection (VIN U)

Also documented for Chevrolet

Documented applications

Skylark — N-body (1986–1991)

1986–1991 Confirmed

Wikipedia's Skylark article dates it 1986–1991, supplied by Pontiac; gnttype.org's 1987 Buick VIN table prints it for the Skylark Custom and Limited four-door, a second source (owner ruling, 2026-11-05: a T3 page that names the code for the nameplate, with Wikipedia dating every year); the 1986 NICB manual's engine table prints the 2.5 L four-cylinder throttle-body letter U

Somerset — N-body (1985–1987)

1986–1987 Single-source

the Pontiac-built Iron Duke four; Wikipedia's Skylark article lists L68 for the N-body generation from 1986 and its Iron Duke article lists the Somerset for 1985–1987; gnttype.org's 1986 and 1987 Buick VIN tables print L68 only on the Skylark Custom and Limited rows, never on a Somerset row, so they are not a second source for this car; 1985 is left out because the Skylark article's engine list starts the code in 1986 and gnttype's 1985 table repeats its 1986 table; the NICB manuals print VIN U for the 2.5L L4 TBI but no RPO codes

This page aggregates every documented appearance of L68 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.