Buick Century · Engine family

Buick Century 3.1L six-cylinder

The LG8 is the most common engine code the VIN decodes to on the 3.1L six-cylinder configurations below; hybrid variants of the same displacement carry their own code. We decode it on 21,790 VINs across 23 factory builds, and 60 listings are reported active. The configuration price reference is $4,091.

Cylinders
6
Induction
Naturally aspirated
Fuel
Gasoline
Fitted
1994–2005

◷ Updated September 30, 2026 ▤ National asking prices, refreshed nightly

$4,091
Configuration price reference
60
On sale today with the 3.1L 6-cyl
1994–2005
Model years it was fitted
23
Factory configurations
21,790
Century VINs decoded with it

The price reference is the median of configuration medians, not the median of all active cars. Each configuration has equal weight. Configurations with at least 3 priced listings are used when available; otherwise the reference uses the configurations with a recorded price. Model years, mileage and condition vary. Open a model-year report below for its asking prices across all engines.

Which Century years got a 3.1L 6-cyl engine

Every model year this engine was fitted to, newest first. The bar is how much of the family's VIN volume sits in that year — long bars are the years this engine was everywhere.

Year Share of VINs VINs On sale Builds
2005 2,482 8 2
2004 3,449 13 2 2003 187 1 1 2002 5,006 15 2 2001 3,551 9 2
2000 3,102 8 2
1999 522 1 1
1998 1,726 3 2
1997 546 — 2
1996 506 1 2
1995 408 — 3
1994 305 1 2

VIN counts come from our decode of the model's build patterns, not from live listings. A year link opens the full Century report for that year — every engine of the model, not just this one.

23 factory configurations with this engine

Each one is a distinct build as the VIN decodes it — trim, body, gearbox and equipment. Open a build sheet for its full spec and the VINs recorded on it.

2005

1 build
2005 Century Custom 2g4ws55j Sedan

2004

2 builds
2004 Century Custom 2g4ws55j Sedan 2004 Century Custom 2g4ws52j Sedan

2003

1 build
2003 Century Custom 2g4ws55j Sedan

2002

2 builds
2002 Century Limited 2g4wy55j Sedan 2002 Century Custom 2g4ws52j Sedan

2001

2 builds
2001 Century Custom 2g4ws52j Sedan 2001 Century Limited 2g4wy55j Sedan

2000

2 builds
2000 Century Custom 2g4ws52j Sedan 2000 Century Limited 2g4wy55j Sedan

1999

1 build
1999 Century Limited 2g4wy52m Sedan

1998

2 builds
1998 Century Custom 2g4ws52m Sedan 1998 Century Limited 2g4wy52m Sedan

1997

2 builds
1997 Century Limited 2g4wy52m Sedan 1997 Century Custom 2g4ws52m Sedan

1996

2 builds
1996 Century Special/Special Wagon 1g4ag85m 1996 Century Special/Special Wagon 1g4ag55m Sedan

1995

3 builds
1995 Century Special/Special Wagon 1g4ag55m Sedan 1995 Century Custom 1g4ah55m Sedan 1995 Century Special/Special Wagon 1g4ag85m

1994

2 builds
1994 Century Special/Special Wagon 1g4ag55m Sedan 1994 Century Special/Special Wagon 3g4ag55m Sedan

Showing the 22 most-built configurations of 23. Every 2005 Century build →

The 3.1L 6-cyl Century: common questions

Which Century years have the 3.1L 6-cyl?

1994–2005, without a break — 12 model years in our VIN decode, across 23 factory configurations and 21,790 VINs.

What does a 3.1L 6-cyl Century cost?

$4,091 is a configuration price reference: the median of configuration medians, with each priced configuration weighted equally. It is not a listing-level median or a valuation of an individual car. The year-by-year ladder shows VIN and inventory counts; its links open model-year price reports covering all engines.

What is the engine code, and does it matter?

LG8 — the code the VIN decodes to on the configurations on this page. It matters when you order parts or read a service history: the same displacement badge on another model can be a different code with different outputs.

3.1L 6-cyl Century on the market

Individual vehicles carrying this engine, each with its own listing-history page. The sample is pinned to fixed VIN buckets, so it does not reshuffle day to day.