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2003 Pontiac Montana 4WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Montana 4WD.

The 2003 Pontiac Montana 4WD is the all-wheel-drive iteration of the model, and its routine engine-oil service calls for 4.5 quarts of 5W-30 API oil. Across the 1997–2008 model run, owner complaints peaked at 262 for the 1999 model year and hit a low of just one for 2008, while the 2003 model accumulated 97 complaints with Fuel System, Gasoline cited as the top concern area and seven recalls on record. That places the 2003 Montana 4WD below the generation’s worst year but well above its cleanest, so researchers should treat it as a mid-pack data point rather than the run’s most troubled or most trouble-free entry.

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

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 Note the factory front wiper blades and cabin air filter are now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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

Tire sizeP225-60R16OEM · verified

OE service part numbers OEM · verified

Engine oil filter	12731175 alt 25322835
Engine air filter	19166106
Fuel filter	10290491 alt 10333072
Spark plug	12681664
Front wiper blades	10329207 discontinued · alt 10329206
Serpentine belt	12576454 alt 12588408
Thermostat	24507563 alt 10226107
Cabin air filter	10322538 discontinued

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	201.2 in
Overall width	72.8 in
Overall height	68.1 in
Wheelbase	120.1 in
Curb weight	3942 lb
Track (front / rear)	61.4 / 63.4 in
Weight distribution (front / rear)	58/42

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. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

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

Engine torques

Intake Manifold to Engine Bolts	Upper: 18 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	12 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Valve Cover Bolts	7.4 ft-lbs

Chassis torques

Lug Nuts	100 ft-lbs
Transfer Case Fill Plug	24.0 ft-lbs
Transfer Case Drain Plug	21.0 ft-lbs

Ignition

Cylinder Firing Order	1-2-3-4-5-6
Spark Plug Manufacturer	AC Delco
Spark Plug Gap	0.060 in
Spark Plug Torque	11.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Oil Group	PAG
Oil Type	46
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca

Service checks

Key ON Engine OFF (KOEO)	52-59
Fuel Pump Pressure Minimum	59.0 psi
RPM	42-56 @ Idle rpm
Injector Primary Resistance	11-14 na ohms
Engine Compression	100
Engine Compression	100 Minimum psi
Engine Oil Pressure	60 psi
Engine Oil Pressure RPM	1850 rpm

Brakes

Brake Application	WITH REAR DISC
Torque Caliper to Bracket	32 ft-lbs
Torque to Knuckle	92 ft-lbs
Brake Application	WITH STANDARD
Torque to Knuckle	137 ft-lbs
Torque Caliper to Bracket	40 ft-lbs
Brake Application	WITH STANDARD
Torque to Knuckle	137 ft-lbs

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 2 stages

1	44 ft. lbs.	44 ft. lbs
2	95 degrees.	95 degrees

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.

Owner complaints about the 2003 Pontiac Montana 4WD top in one area — the fuel system, gasoline, 12 of 97 reports (12%), well ahead of the next concern. That matters, because the fuel system, gasoline are also the target of recall 07V-349 on this vehicle — so the single most useful check before buying or servicing one is confirming it was actually performed. 9 of the reports describe a crash and 2 a fire — a small share of the total, but worth weighing against the fuel system, gasoline pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

9 involved a crash · 2 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’97 ’98 ’99 ’00 ’01 ’02’03’04 ’05 ’06 ’07 ’08

Owner complaints filed with NHTSA, by component

All 97 complaints on record, top 8 components.

Fuel System, Gasoline12

Engine & Engine Cooling12

Air Bags8

Exterior Lighting7

Electrical System7

Structure4

Electrical System,Exterior Lighting3

Visibility3

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 7 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…

07V349000Fuel System, Gasoline:StorageReported 08/08/2007

ON CERTAIN VEHICLES, VARIATIONS IN THE MANUFACTURING PROCESS OR EXPOSURE TO HIGH AMBIENT TEMPERATURES MAY LEAD TO FRACTURE OF THE FUEL TANK INLET CHECK VALVE (ICV). Remedy: DEALERS WILL REPLACE THE FUEL TANK. THE RECALL WILL BE MAILED IN TWO PHASES WITH THE FIRST PHASE BEGINNING ON DECEMBER 4, 2007. THE SECOND PHASE WILL BE MAILED ON DECEMBER 13…