MitsubishiMontero20033.8L/mitsubishi/montero/2003/3-8l/

2003 Mitsubishi Montero — 3.8L

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Montero 3.8L.

Body SUVEngine 3.8LTransmission Automatic (S5)

The 2003 Mitsubishi Montero is an SUV powered by a 3.8-liter engine paired with a five-speed automatic transmission, returning EPA ratings of 13 mpg city, 18 mpg highway, and 15 mpg combined. Within the model's owner-complaint record — which spans 1990 through 2006 and ranges from a low of just one complaint in 2005 to a high of 174 in 2002 — the 2003 model year registers 83 total complaints and two recalls, with the power train identified as the leading problem area. For a researcher, that 83-complaint figure places the 2003 Montero well above the model's quietest year and well below its early-decade peak, a mid-pack data point that resists any simple read of the nameplate as uniformly reliable or uniformly troubled.

Model year2006200520042003

Quick specs

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

Lug nut torque72-87 ft-lbsOEM · verified
EPA fuel economy13/18/15 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 24F · 585 CCA battery, OE oil filter MZ690116. 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 24F · 585 CCAOEM · verified
Tail / brake / turnOFFOEM · verified
Tire size4WD:P225-75R15OEM · verified
Wheel / rim6-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filterMZ690116
Engine air filterMR571476
Fuel filterMR526974
Spark plugMN119487 alt MR984943
Front wiper bladesMR361327 alt MR522387
Serpentine beltMN183597
Thermostat1305A191

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (S5)

Dimensions & weight NHTSA vPIC

Overall length181.1 in
Overall width66.9 in
Overall height67.7 in
Wheelbase107.5 in
Curb weight4112 lb
Track (front / rear)57.9 / 58.3 in
Weight distribution (front / rear)55/45

Ratings & economy EPA / vPIC

EPA city / highway / combined13 / 18 / 15 mpg
DrivetrainRear-Wheel Drive
Recommended fuelPremium Gasoline

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

No 2003 road test on record; the results below are same-engine tests from nearby model years, each shown under its own year.

9.6 sec0–60 mph (tested)quickest 9.60 sec — 2005 Limited
215 hpHorsepower (as tested)
248 lb-ftTorque (as tested)
YearTrim / engine0–60¼ mileHPDrivetrain
2005Limited 3.8L V69.60 sec17.30 sec215 hp4x4

Service quick specs OEM factory data

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

This engine DOT 3 · DOT 4 brake fluid. Torque lug nuts to 72-87 ft-lbs, the oil drain plug to 29.0 ft-lbs. The firing order is 1-2-3-4-5-6.

Lubricants & capacities

Brake FluidDOT 3 · DOT 4
Engine CoolantETHYLENE GLYCOL
Power Steering FluidGenuine Mitsubishi PS fluid
Power Steering FluidUse Mitsubishi PS fluid

Engine torques

Engine Oil Pan Drain Plug29.0 ft-lbs

Chassis torques

Lug Nuts72-87 ft-lbs
Transfer Case Fill Plug22.0-25.0 ft-lbs
Transfer Case Drain Plug22.0-25.0 ft-lbs
Front Wheel Hub188 ft-lbs
Rear Wheel Hub188 ft-lbs

Ignition

Cylinder Firing Order1-2-3-4-5-6
Spark Plug Gap0.028-0.031 in
Spark Plug Torque15.0-21.0 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.10-1.25 lbs
Oil GroupPAG
Oil Type56
Oil Capacity4.70 oz
Standard BCI Group Number24F
Standard BCI Cranking Performance585 cca

Service checks

Pressure Test23 psi
Radiator Cap Pressure Relief14-18 psi
Thermostat Opening Temperature187-193 °F
Engine Compression127-171 psi
Engine Oil Pressure4.2 psi @ Idle, 43-100 psi @ 3500 rpm psi
Intake Valve LashHydraulic in
Exhaust Valve LashHydraulic in

Brakes

Torque Caliper to Bracket66 ft-lbs / 33 ft-lbs
Torque to Knuckle83 ft-lbs / 74 ft-lbs
Minimum Pad ThicknessFront: 0.080; Rear: 0.080 in
Minimum Shoe Thickness0.039 in
Rotor Runout Limit0.0024 in
Rotor Nominal Thickness From1.024 in / 0.866 in
Rotor Nominal Thickness To1.024 in / 0.866 in
Rotor Discard at or Under0.96 in / 0.8 in

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 7,500 mi; spark plugs every 60,000 mi; coolant at 60,000 mi. The big-interval services (at 60,000 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 miBrake Hydraulic System (inspect fluid level) · Clutch Master Cylinder (inspect fluid level) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Power Steering System (inspect) · Tire & Wheel Assembly (rotate)
Every 15,000 miAxle Shaft Oil Seal (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect)
Every 30,000 miAccessory Drive Belt (inspect) · Brake System (inspect) · Differential (inspect fluid level) · Drive Axle Assembly (drain & refill) · Driveshaft U-Joint (inspect) · Engine Air Filter Element (replace)
At 60,000 miEngine Coolant System (drain, flush & refill)
Every 60,000 miFuel Evaporative Emission Control System (inspect) · Fuel Line (inspect) · Fuel Tank (inspect) · Fuel Tank Filler Cap (inspect) · Spark Plug Wires (replace) · Timing Belt (replace)
At 105,000 miSpark Plugs (replace)

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 Mitsubishi Montero sits at the apex of a pronounced spike in federal complaints, with 174 reports—far above the surrounding years (56 in 2000 and only 5 in 2004). This surge is accompanied by a modest rise in recalls (4) and investigations (1), while technical service bulletins also peak at 110, indicating heightened manufacturer response activity. The top complaint categories—Power Train (11), Engine & Engine Cooling (7), Electrical System (6), and Air Bags (5)—suggest that drivetrain and electronic issues were the primary concerns, though the data does not specify root causes. Crash‑related complaints (12) and fire reports (3) are relatively low compared with the overall complaint volume, implying most problems were non‑safety‑critical. Because 2003 represents an outlier year with unusually high defect reporting, it is a riskier choice than adjacent model years, and prospective buyers should consider later years (2004‑2006) that show dramatically fewer complaints.

2
Open recalls
NHTSA campaigns
71
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
83
Owner complaints
12 involved a crash · 3 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 83 complaints on record, top 8 components.

Power Train11
Engine & Engine Cooling7
Electrical System6
Air Bags5
Service Brakes, Hydraulic5
Fuel System, Gasoline5
Service Brakes4
Visibility4

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

Technical service bulletins NHTSA · verified

Showing 5 of 71 bulletins on record with NHTSA.

BulletinDateComponentSummary
DEALER LETTER2023-07-21EquipmentThis is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has…
TSB-23-00-0042023-04-24StructureThis Technical Service Bulletin provides instructions and material safety data sheets for…
TSB-23-00-0012023-04-24EquipmentThis Technical Service Bulletin reviews the regulations that require a label showing the…
DEALER LETTER2023-04-21EquipmentThis is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has…
TSB-22-54-0032022-04-07Exterior LightingThis Technical Service Bulletin was sent to dealers to explain the difference between…

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 Montero. 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.

Reference guides

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

Frequently asked

Does the 2003 Montero have open recalls?

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

What gas mileage does the 3.8L get?

EPA figures are 13 city / 18 highway / 15 combined mpg.