1978Delta88X

When, exactly, did production of the Oldsmobile 5.7 V8 and 4.3 V6 diesels end?

I also would like to know what the latest build dates and serial #s were on the 1985 model year units. Consider the fact that the 1985 model year production started in August 1984, and sales in September 1984.

Some sources point out the diesels were dropped mid-year (think between January-March 1985), but I am suspicious now that the last remaining diesels may have been dropped at the formal end of the '85 model year (July-September 1985), and some '86s may have gotten out with the 4.3 V6 as well.

Engine RPO codes:
LF9 = 5.7 V8, rear-drive (B,G body)
LS2 = 4.3 V6, front-drive (C body)
LT6 = 4.3 V6, rear-drive (G body)
LT7 = 4.3 V6, front-drive (A body)
LT9 = 5.7 V8, front-drive (E,K body)

List of cars powered by Oldsmobile diesel power in 1985:
Buick LeSabre and Electra Estate (B) (LF9)
Buick Riviera (E) (LT9)
Buick Century (A FWD) (LT7)
Buick Electra (C FWD) (LS2)
Cadillac Fleetwood Brougham (C RWD) (LF9)
Cadillac Eldorado (E) (LT9)
Cadillac Seville (K) (LT9)
Cadillac DeVille and Fleetwood (C FWD) (LS2)
Chevrolet Caprice and Impala (B) (LF9)
Chevrolet Celebrity (A) (LT7)
Oldsmobile Delta 88 and Custom Cruiser (B) (LF9)
Oldsmobile Cutlass Supreme (G) (LF9)
Oldsmobile Toronado (E) (LT9)
Oldsmobile Cutlass Ciera/Cruiser (A) (LT7)
Oldsmobile Ninety-Eight (C FWD) (LS2)
Pontiac Parisienne (B) (LF9)
Pontiac 6000 (A) (LT7)

List of Oldsmobile diesel powered cars dropped after 1984:
Buick Electra (C RWD) (LF9)
Cadillac DeVille/Fleetwood (Fleetwood exc. Brougham) (LF9)
Chevrolet Monte Carlo (G) (LF9)
Oldsmobile Ninety-Eight (C RWD) (LF9)
Pontiac Grand Prix (G) (LF9)
Pontiac Bonneville (G) (LF9)

I am also asking you these questions as to see how young your 1985 Oldsmobile diesel powered jobs are. Like, say, yours was made in September 1984, or April 1985.

~Ben