Somerset — N-body (1985–1987)

the Buick V6 introduced for the Somerset, 125 hp, with the three speed automatic only (Wikipedia's Skylark article); Wikipedia's Buick V6 engine article prints LN7 and VIN code L and lists the Somerset for 1985–1987; gnttype.org's 1986 and 1987 Buick VIN tables print it for the Somerset Custom and Limited, a second source (owner ruling, 2026-11-05: a T3 page that names the code for the nameplate, with Wikipedia dating every year); its 1985 table repeats the 1986 table, so 1985 rests on Wikipedia; the NICB manuals print VIN L for the 3.0L V6 MFI but no RPO codes

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