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Ninth generation
1990 Oldsmobile Eighty Eight Royale sedan
Overview
Also called	Oldsmobile Delta 88 (1986–88) Oldsmobile Eighty Eight (1989–91)
Model years	1986–1991
Assembly	Flint, Michigan Ypsilanti, Michigan Wentzville, Missouri
Body and chassis
Body style	2-door coupe 4-door sedan
Layout	Transverse front-engine, front-wheel drive
Platform	H-body
Related	Buick LeSabre Pontiac Bonneville
Powertrain
Engine	3.8 L Buick LG3 V6 Specifications Years Used: 1986-1988  • Family: GM Buick 90° V6  • RPO/VIN: LG3/3  • Displacement: 3,791 cc (231 cu in)  • Stroke: 3.40 in (86 mm)  • Bore: 3.80 in (97 mm)  • Power: 150 hp (112 kW) at 4,400 rpm  • Torque: 210 lb·ft (285 N·m) at 2,200 rpm  • Fuel Type: Gasoline  • Fuel System:SFI  • Configuration: 12V/OHV  • Compression: 8.5:1  • Aspiration: Normal 3.8 L Buick 3800 LN3 V6 Specifications Years Used: 1988-1991  • Family: GM Buick 90° V6  • Model: 3800  • RPO/VIN: LN3/C  • Displacement: 3,791 cc (231 cu in)  • Stroke: 3.40 in (86 mm)  • Bore: 3.80 in (97 mm)  • Power: 165 hp (123 kW) at 4,400 rpm  • Torque: 220 lb·ft (298 N·m) at 2,800 rpm  • Fuel Type: Gasoline  • Fuel System:MPFI  • Configuration: 12V/OHV  • Compression: 8.5:1  • Aspiration: Normal
Transmission	4-speed 440-T4/4T60 automatic
Dimensions
Wheelbase	110.8 in (2,814 mm)
Length	1986–88: 197.6 in (5,019 mm) 1989 Brougham: 196.1 in (4,981 mm) 1990–91: 196.3 in (4,986 mm)
Width	1986–89: 72.4 in (1,839 mm) 1990–91: 73.0 in (1,854 mm)
Height	Delta 88 coupe: 55.5 in (1,410 mm) Delta 88 sedan: 54.7 in (1,389 mm) Eighty Eight Royale coupe: 53.7 in (1,364 mm) Eighty Eight Royale sedan: 54.5 in (1,384 mm) Eighty Eight coupe: 53.9 in (1,369 mm) Eighty Eight sedan: 54.6 in (1,387 mm)

 

1986 Oldsmobile Delta 88 Royale Brougham coupe, rear view

 

1987–1988 Oldsmobile Delta 88 Royale sedan

 

1990–1991 Oldsmobile Eighty Eight Royale sedan

 

1990 Oldsmobile Eighty Eight Royale sedan, rear view

For 1986, the Delta 88 switched platforms from the GM B platform to the smaller front-wheel drive H platform, with a wheelbase of only 110.8 inches (2,814 mm).

The headlights changed from square sealed beam quads to integrated regular/high beam composite lamps in 1987. A few NASCAR teams built racecars with 1986 Delta 88 sheetmetal and ran them on the circuit in the 86-88 seasons; however only one victory (with Terry Labonte) was scored.

Due to the federal mandate to add passive restraints, door mounted seat belts were added for 1987.

For 1988, rear shoulder belts were added.

For 1989, the "Delta" name was dropped, as was the hood ornament, leaving the model to simply become the "Eighty Eight," now spelled out instead of using the "88" in numerical form, and deleted the amber color from the taillights. A driver airbag became an available option.

The Eighty Eight was given a mild facelift in 1990, eschewing the former chromed grille for a body-colored fascia with four slots and the Oldsmobile Rocket logo. In the rear, new taillights and backup lights extended across the body; once again, chrome trim was deleted. Minor revisions were also made to the interior. Part of the door panel was revised and 1990 also offered new cloth for the seats. The Pillow Cushion seats on the Brougham were deleted. A revised armrest console was also added, this one provided more room. As an option was a revised electronic climate control system. A new choice of alloy wheels was an option.

1991 was the last year for the coupe. The model range during this time was the standard Eighty Eight, the Eighty Eight Royale, and the Eighty Eight Royale Brougham, in ascending order.

Engines:

• 1986–1988.5 – 3.8 L (231 in³) LG3 V6
• 1988.5–1991 – 3.8 L (231 in³) 3800 LN3 V6

Transmissions:

• 1986–1988.5 – 440-T4 4-speed automatic overdrive
• 1988.5–1991 – 4T60 4-speed automatic overdrive

Voice diagnostic system

This generation of Delta 88s had an optional voice diagnostic system that alerted the driver of problems. The voice was male and computer synthesized.

In the event of a warning, the door chime played three times rapidly and then played the voice alert. This happened twice in case the driver missed the warning the first time. Every alert also had a corresponding light on the instrument cluster.

Warnings included:

• "The engine coolant level is low!"
• "The engine is overheating! Please stop the engine and consult the owner's manual!"
• "The park brake is not fully released!"
• "The key is in the ignition!" (Upon opening the door with the key inserted into the ignition.)
• "The headlights are on!" (Upon turning off the car with the headlights on.) A light would also appear on the dash