1984 Buick Riviera Specs
4 powertrain configurations on federal record for the 1984 Buick Riviera: 3.8L 6-cyl Regular Gasoline; 4.1L 6-cyl Regular Gasoline; 5.0L 8-cyl Regular Gasoline; 5.7L 8-cyl Diesel, rated up to 21 MPG combined by the EPA.
Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research
| Engine | Transmission | Drivetrain | City | Highway | Combined |
|---|---|---|---|---|---|
| 3.8L 6-cyl Regular Gasoline | Automatic 4-spd | — | 13 | 20 | 15 |
| 4.1L 6-cyl Regular Gasoline | Automatic 4-spd | — | 13 | 20 | 15 |
| 5.0L 8-cyl Regular Gasoline | Automatic 4-spd | — | 14 | 20 | 16 |
| 5.7L 8-cyl Diesel | Automatic 4-spd | — | 18 | 26 | 21 |
Riviera by year
Buying a used Riviera? Specs are the easy half.
then check the specific car: the Full VIN Report shows that VIN's factory build, recall record, and market history before you pay for it.
Frequently asked questions
What engines does the 1984 Buick Riviera have?
4 engines on federal record: 3.8L 6-cyl Regular Gasoline; 4.1L 6-cyl Regular Gasoline; 5.0L 8-cyl Regular Gasoline; 5.7L 8-cyl Diesel, offered with Automatic 4-spd. The full per-configuration table is above.
What gas mileage does the 1984 Buick Riviera get?
EPA combined ratings run 15–21 MPG depending on configuration — the table above shows city/highway/combined for each engine, transmission, and drivetrain.
How do I get the specs for my exact VIN?
These are the federal-record configurations for the 1984 Buick Riviera overall. For one specific vehicle — its exact engine, trim, factory options, and original window sticker — decode the 17-character VIN free at carwhere.com/tools/vin-decoder.
Where does this data come from?
The U.S. EPA's public vehicle dataset (fueleconomy.gov) — the federal record of every US-market configuration since 1984 — refreshed 2026-10-26. Public-domain data; republish with attribution to CarWhere (carwhere.com).