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2003 Buick Century

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Century.

Body PASSENGER CARTransmission Automatic 4-spd

The 2003 Buick Century is a front‑wheel‑drive passenger car whose engine requires 4.5 qt of 5W‑30 API oil and is paired with a four‑speed automatic transmission, delivering EPA‑rated fuel economy of 18/26/21 mpg. With 130 total owner complaints logged for the model year, the most frequent issue area is exterior lighting, and the vehicle was subject to two recalls. Placed within the Century’s 1990‑2005 complaint timeline, the 2003 figure sits well below the 1999 peak of 252 complaints but above the 2005 low of 19, indicating a modest improvement in reliability as the model approached its end.

Model year2005 2004 2003 2002 2001 2000 1999 1998 1997

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity4.5 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque100 ft-lbsOEM · verified

EPA fuel economy18/26/21 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 12731175. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 78 · 600 CCAOEM · verified

OE service part numbers OEM · verified

Engine oil filter	12731175
Engine air filter	15221217
Fuel filter	25121293 discontinued
Spark plug	12681664
Battery	88866305 alt 88866260
Front wiper blades	19120758
Serpentine belt	12588410
Thermostat	24507563 alt 10226107
Cabin air filter	84557894

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length	194.5 in
Overall width	72.8 in
Overall height	56.7 in
Wheelbase	109.1 in
Curb weight	3369 lb
Track (front / rear)	62.2 / 61 in
Weight distribution (front / rear)	62/38

Ratings & economy EPA / vPIC

EPA city / highway / combined	18 / 26 / 21 mpg
Drivetrain	Front-Wheel Drive
Passenger volume	102 cu ft
Cargo volume	17 cu ft
Recommended fuel	Regular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 4.5 qt of 5W-30 API engine oil. Torque lug nuts to 100 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-2-3-4-5-6.

Lubricants & capacities

Engine Oil	5W-30 · API
Engine Oil Capacity	4.5 qt

Engine torques

Exhaust Manifold to Cylinder Head Bolts	12 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Valve Cover Bolts	8.9 ft-lbs

Chassis torques

Lug Nuts	100 ft-lbs
Front Wheel Hub	118 ft-lbs

Ignition

Cylinder Firing Order	1-2-3-4-5-6
Ignition Coil Secondary Resistance	5,000-8,000 ohms
Spark Plug Manufacturer	AC Delco
Spark Plug Type	AC 41-940
Spark Plug Gap	0.060 in
Spark Plug Torque	11.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	2.20 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	9.00 oz
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca

Service checks

Pressure Test	16; Pressure should not exceed 20 psi.
Radiator Cap Pressure Relief	16 psi
Thermostat Opening Temperature	188-206 °F
Fuel Pump Pressure Minimum	52.0 psi
Key ON Engine OFF (KOEO)	52-59
RPM	42-56 @ Idle rpm
Injector Primary Resistance	11-14 @ 70 degreesF ohms
Engine Compression	100

Brakes

Torque Caliper to Bracket	133 ft-lbs / 32 ft-lbs
Torque to Knuckle	100 ft-lbs / 8 ft-lbs
Minimum Pad Thickness	Front: 0.030; Rear: 0.030 specification
Rotor Max Parallel Variation	0.001 in
Rotor Runout Limit	0.002 in
Rotor Nominal Thickness From	1.27 in / 0.43 in
Rotor Nominal Thickness To	1.27 in / 0.43 in
Rotor Minimum Machining	1.224 in / 0.39 in

Multi-step torque procedures OEM · verified

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages

52 ft. lbs., step 2: 72

52 ft. lbs

Cylinder Head — tightening sequence 2 stages

1	44 ft. lbs.	44 ft. lbs
2	turn 95

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 7,500 mi	Tire & Wheel Assembly (rotate)
Every 15,000 mi	Cabin Air Filter (replace)
Every 30,000 mi	Engine Air Filter Element (replace)
Every 100,000 mi	Spark Plug Wires (inspect) · Spark Plugs (replace) · Transmission Fluid & Filter (replace)
At 150,000 mi	Accessory Drive Belt (inspect) · Engine Coolant System (drain, flush & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2003 Buick Century recorded 130 complaints, two recalls and zero investigations, placing it below the 2002 level of 166 complaints but above the 2004 level of 39 complaints. Its total service bulletins count of 415 exceeds the 2002 figure of 396 and the 2004 figure of 405, indicating a slightly higher documentation burden than the immediate surrounding years. The complaint trend across the generation shows a sharp rise through the late 1990s, a peak around 1999‑2000, and a subsequent decline that the 2003 model continues but remains above the post‑2003 lows. The primary complaint categories — Exterior Lighting (36), Electrical System (11), Engine & Engine Cooling (10), and Structure (7) — are consistent with earlier concerns but do not reveal a root cause. Given the moderate complaint volume and absence of fire or crash‑related complaints, the 2003 model is a reasonable purchase option, though not the optimal year in the sequence.

Open recalls

NHTSA campaigns

415

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

130

Owner complaints

4 involved a crash · 2 a fire

NHTSA crash-test rating federal NCAP · out of 5 stars

Rollover★★★★★

Owner complaints by model year NHTSA · this generation & adjacent

’90 ’91 ’92 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02’03’04 ’05

Owner complaints filed with NHTSA, by component

All 130 complaints on record, top 8 components.

Exterior Lighting36

Electrical System11

Engine & Engine Cooling10

Structure7

Service Brakes, Hydraulic7

Electrical System,Exterior Lighting6

Vehicle Speed Control5

Visibility5

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

09E005000SteeringReported 17/02/2009

DORMAN IS RECALLING 979 STEERING KNUCKLES, DORMAN P/NOS. 697-902 AND 697-903, SOLD UNDER DORMAN'S "OE SOLUTIONS<SUP>TM</SUP>" BRAND NAME, AND NAPA P/NOS. 7-8502 AND 7-8503 WHICH WERE SOLD FOR REPLACEMENT USE ON THE… Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE STEERING KNUCKLES FREE OF CHARGE AND REIMBURSE THE REPAIR FACILITY OR OWNER FOR LABOR. THE RECALL BEGAN ON FEBRUARY 23, 2009…

07E021000Fuel System, Other:Storage:Tank Assembly:Pressure Relief DevicesReported 12/03/2007

CERTAIN DELPHI FUEL PRESSURE REGULATORS, P/NOS. FP10020-11B1, FP10026-11B1, AND FP10027-11B1, SOLD AFTER JANUARY 9, 2007, AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES LISTED ABOVE. THE UNIVERSAL PRESSURE… Remedy: DELPHI WILL NOTIFY OWNERS AND REPLACE THE UPR FREE OF CHARGE. THE RECALL BEGAN ON APRIL 23, 2007. OWNERS CAN CONTACT DELPHI AT 877-411-8770.

Technical service bulletins NHTSA · verified

Showing 5 of 415 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
PIP5601C	2025-07-18	Unknown Or Other	This PI communicates the requirement to provide a pico file to receive diagnostic…
PIP5358D	2025-02-19	Unknown Or Other	This Preliminary Information communication provides information to the technician about…
PIP4723J	2024-10-25	Electrical System	This Preliminary Information communicates to the dealer the process for downloading or…
PIT5099H	2024-09-12	Unknown Or Other	This Preliminary Information communication provides information to the technician about…
PIT5099H	2024-09-12	Unknown Or Other	This Preliminary Information communication provides information to the technician about…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420

Catalyst system efficiency below threshold — Bank 1

P0300

Random / multiple cylinder misfire detected

P0171

System too lean — Bank 1

P0455

Evaporative emission system leak detected — large leak

P0128

Coolant thermostat below regulating temperature

P0442

Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific Century. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 78 battery Vehicles taking 4.5 qt Engine oil filter 12731175 Engine air filter 15221217 Fuel filter 25121293 Spark plug 12681664

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 2003 Century take?

4.5 qt of 5W-30 API, per the factory manual.

Does the 2003 Century have open recalls?

NHTSA lists 2 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Century get?

EPA figures are 18 city / 26 highway / 21 combined mpg.