The Oldsmobile Diesel engine is a series of V6 and V8 diesel engines produced by General Motors from 1978 to 1985. The V8 was introduced in 1978, followed by a V8 only for the 1979 model year. In 1982, a V6 became available for both front and rear-wheel drive vehicles. Sales peaked in 1981 at approximately 310,000 units, which represented 60% of the total U.S. passenger vehicle diesel market. However, this success was short-lived as the V8 diesel engine suffered severe reliability issues, and the engines were discontinued after the 1985 model year. V8 engines LF9 The LF9 is a diesel V8 produced from 1978 to 1985. Earlier versions and those used in pickups (1978-1981) produced and torque, while later versions produced and torque. Applications: 1981 Buick Century 1980–1984 Buick Electra 1982–1985 Buick LeSabre 1981–1985 Buick Regal 1981–1985 Buick Riviera 1980–1984 Cadillac de Ville 1979–1985 Cadillac Eldorado 1980–1985 Cadillac Fleetwood Brougham 1978–1985 Cadillac Seville 1980–1982 Checker Marathon 1981–1985 Chevrolet Caprice 1982–1984 Chevrolet El Camino 1981–1985 Chevrolet Impala 1982–1983 Chevrolet Malibu 1982–1984 Chevrolet Monte Carlo 1978–1981 C10 pickup 1982–1984 GMC Caballero 1978–1981 C1500 pickup 1978–1985 Oldsmobile Custom Cruiser 1978–1983 Oldsmobile Cutlass Cruiser 1978–1980 Oldsmobile Cutlass Salon 1978–1985 Oldsmobile Cutlass Supreme/Cutlass Calais 1978–1985 Oldsmobile Delta 88 1978–1984 Oldsmobile Ninety-Eight 1979–1985 Oldsmobile Toronado 1980–1984 Pontiac Bonneville 1980–1981 Pontiac Catalina 1981–1984 Pontiac Grand Prix 1981–1985 Pontiac Parisienne LF7 The short-lived LF7 is a V8 putting out and torque. Applications: 1979 Oldsmobile Cutlass Salon 1979 Oldsmobile Cutlass Supreme/Cutlass Calais V6 engines In 1982, GM introduced a 4.3-liter V6 for longitudinal and transverse applications. All versions of the engine were rated at at 3600 rpm and at 1600 rpm. LT6 The LT6 was produced from 1982 to 1984 and installed in rear-wheel drive vehicles. Applications: 1982–1984 Buick Regal 1982–1983 Chevrolet Malibu 1982–1983 Chevrolet Monte Carlo 1982–1984 Oldsmobile Cutlass Supreme/Cutlass Calais LT7 The LT7 is a transverse engine version produced from 1982 to 1985. Applications: 1982–1985 Buick Century 1982–1985 Chevrolet Celebrity 1982–1985 Oldsmobile Cutlass Ciera 1982–1985 Pontiac 6000 LS2 The LS2 was produced only in 1985 and installed in front-wheel drive vehicles. Applications: 1985 Buick Electra 1985 Cadillac de Ville 1985 Cadillac Fleetwood 1985 Oldsmobile Ninety-Eight Problems While designing the original 350 cu in diesel, Oldsmobile left the head bolt design and pattern unchanged to enable them to use the same tooling as for the gasoline engines, unlike a proper gasoline to diesel conversion. This led to