Factory build sheet
1991 Buick Roadmaster Estate Wagon
Build 1G4BR83E-M · 5L 8cyl · Wagon
VIN positions 1 through 8 read 1G4BR83E and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every Roadmaster whose VIN starts 1G4BR83E and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 23 of them.
- Decoded Jul 7, 2026
- 23 known VINs
- 1 listed for sale now
Factory specification
As filed by Buick with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.
Engine
- Displacement
- 5 L
- Cylinders
- 8
- Configuration
- V-Shaped
- Engine manufacturer
- CPC
- Fuel type
- Gasoline
Body & chassis
- Body class
- Wagon
- NHTSA body type
- PASSENGER CAR
- Doors
- 4
- Manufacturer
- GENERAL MOTORS LLC
Weight rating
- GVWR class
- Class 1
- GVWR
- 6,000 lb or less
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
How this VIN pattern is read
A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.
| Positions | Characters | What they encode |
|---|---|---|
| 1–3 | 1G4 | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | BR83E | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | M | Model year — 1991 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
23 vehicles carry this build
Every VIN we have decoded to 1G4BR83E-M shares the specification above.
- 23 Known VINs
- 1 Listed for sale now
- 1G4BR83E 7MW402603
- 1G4BR83E 7MW405792
- 1G4BR83E 9MW407205
- 1G4BR83E 6MW405458
- 1G4BR83E 9MW402327
- 1G4BR83E 1MW404900
- 1G4BR83E 2MW402914
- 1G4BR83E 9MW404059
- 1G4BR83E 8MW400827
- 1G4BR83E 1MW407392
- 1G4BR83E 6MW401202
- 1G4BR83E 9MW406751
- 1G4BR83E 8MW404070
- 1G4BR83E 5MW402339
- 1G4BR83E XMW404037
- 1G4BR83E 6MW405816
- 1G4BR83E 4MW402817
- 1G4BR83E 0MW406931
- 1G4BR83E 2MW405845
- 1G4BR83E 5MW401255
- 1G4BR83E 1MW404797
- 1G4BR83E XMW405298
- 1G4BR83E 3MW400704
Keep going
Where this data comes from
Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.
Vehicle counts come from the 23 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.