1984 Buick Century Specs

7 powertrain configurations on federal record for the 1984 Buick Century: 2.5L 4-cyl Regular Gasoline; 3.0L 6-cyl Regular Gasoline; 3.8L 6-cyl Regular Gasoline; 4.3L 6-cyl Diesel, rated up to 25 MPG combined by the EPA.

Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research

1984 Buick Century engines, transmissions, drivetrains and EPA gas mileage
Engine	Transmission	Drivetrain	City	Highway	Combined
2.5L 4-cyl Regular Gasoline	Automatic 3-spd	—	20	28	23
3.0L 6-cyl Regular Gasoline	Automatic 3-spd	—	17	24	20
3.8L 6-cyl Regular Gasoline	Automatic 4-spd	—	16	23	19
4.3L 6-cyl Diesel	Automatic 3-spd	—	21	31	25
3.0L 6-cyl Regular Gasoline	Automatic 3-spd	—	16	22	18
4.3L 6-cyl Diesel	Automatic 3-spd	—	21	29	24
4.3L 6-cyl Diesel	Automatic 4-spd	—	21	31	24

Century by year

2005 2004 2003 2002 2001 2000 1999 1998 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984

Buying a used Century? 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 Century have?

4 engines on federal record: 2.5L 4-cyl Regular Gasoline; 3.0L 6-cyl Regular Gasoline; 3.8L 6-cyl Regular Gasoline; 4.3L 6-cyl Diesel, offered with Automatic 3-spd, Automatic 4-spd. The full per-configuration table is above.

What gas mileage does the 1984 Buick Century get?

EPA combined ratings run 18–25 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 Century 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).