MitsubishiDiamante19943.0L/mitsubishi/diamante/1994/3-0l/

1994 Mitsubishi Diamante — 3.0L

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1994 Diamante 3.0L. Covers both the standard and High Output 3.0L.

Engine 3.0LTransmission Automatic 4-spd

The 1994 Mitsubishi Diamante 3.0L is powered by a 3.0-liter engine paired with a four-speed automatic transmission and carries EPA fuel-economy ratings of 16 mpg city, 22 mpg highway, and 18 mpg combined, while routine oil service calls for 4.2 quarts of 20W-40, 10W-30, or 5W-30 API oil. Within the 1992–2004 model complaint record, owner reports peaked at 133 for the 2002 model year and bottomed out at three for 2004, placing this 1994 model's 34 complaints and two recalls well below the series' worst years. Air bags stand out as the top complaint area for this year, a notable caveat even though the overall volume makes the 1994 Diamante a comparatively quiet early entry in the model's history.

Model year19961995199419931992

Quick specs

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

Engine oil capacity4.2 qtOEM · verified
Engine oil type20W-40 / 10W-30 / 5W-30 APIOEM · verified
EPA fuel economy16/22/18 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses OE oil filter MD136790. 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.

Tire size4WD:P225-75R15OEM · verified
Wheel / rim6-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filterMD136790
Engine air filterMR571471
Fuel filterMB658684
Spark plugMS851238 alt MS851336
Front wiper bladesMR300876 alt MZ690946
Serpentine beltMD172376 alt MZ690263
ThermostatMD972903 alt 1305A191

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined16 / 22 / 18 mpg
DrivetrainFront-Wheel Drive
Passenger volume94 cu ft
Cargo volume14 cu ft
Recommended fuelPremium Gasoline

Performance & power Independent road tests

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

No 1994 road test on record; the results below are same-engine tests from nearby model years, each shown under its own year.

8.8–9.2 sec0–60 mph (tested)quickest 8.80 sec — 1992 LS Sedan
202 hpHorsepower (as tested)
202 lb-ftTorque (as tested)
YearTrim / engine0–60¼ mileHPDrivetrain
1992LS Sedan 3.0L V68.80 sec16.80 sec202 hpFWD
1992LS Sedan 3.0L V68.90 sec16.60 sec202 hpFWD
1992LS Sedan 3.0L V69.20 sec17.00 sec202 hpFWD

Service quick specs OEM factory data

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

This engine holds 4.2 qt of 20W-40 / 10W-30 / 5W-30 API engine oil, DOT 3 · DOT 4 brake fluid.

Lubricants & capacities

Brake FluidDOT 3 · DOT 4
Engine CoolantETHYLENE GLYCOL
Engine Oil20W-40 · API · 10W-30 · 5W-30
Engine Oil Capacity4.2 qt
Power Steering FluidUse Mitsubishi PS fluid

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 every 30,000 mi. The big-interval services (every 30,000 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) · Power Steering System (inspect)
Every 15,000 miAxle Shaft Oil Seal (inspect) · Brake Line (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect) · Engine Oil Filter (replace)
Every 30,000 miAccessory Drive Belt (inspect) · Brake System (inspect) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · Exhaust System (Complete) (inspect) · Fuel Line (inspect)
Every 60,000 miBalance Shaft Drive Belt (replace) · Distributor Cap (inspect) · Distributor Rotor (inspect) · Fuel Evaporative Emission Control System (inspect) · Fuel System (inspect) · Spark Plug Wires (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 1994 Mitsubishi Diamante recorded 34 complaints, 2 recalls, and 17 technical service bulletins, showing a modest decline from the 49 complaints and 2 recalls in 1992 and the 35 complaints and 3 recalls in 1993. Complaints continued to fall sharply in 1995 to just 12 with no recalls, indicating an improving trend early in the generation. After 1995, complaint numbers rose again, peaking at 133 in 2002 before dropping to low levels in 2004. Thus, the 1994 model sits in the early, decreasing‑complaint phase of the generation’s federal‑record arc. For a buyer seeking a used Diamante, the 1994 year offers relatively low complaint and recall rates compared with later years, making it a reasonable choice, though the 1995 model shows even better numbers if available.

2
Open recalls
NHTSA campaigns
17
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
34
Owner complaints
7 involved a crash · 0 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 34 complaints on record, top 8 components.

Air Bags8
Service Brakes, Hydraulic6
Tires3
Seat Belts3
Engine & Engine Cooling2
Vehicle Speed Control2
Power Train2
Exterior Lighting2

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

96V143002Service Brakes, Hydraulic:Foundation Components:Hoses, Lines/Piping, And FittingsReported 12/08/1996

UNDER CONDITIONS OF FULL LOCK STEERING AND FULL SUSPENSION TRAVEL, THE LEFT OR RIGHT FRONT WHEEL-SIDE BRAKE HOSE CAN CRACK, RESULTING IN BRAKE FLUID LEAKAGE. Remedy: DEALERS WILL REPLACE THE LEFT AND RIGHT FRONT WHEEL-SIDE BRAKE HOSES WITH REVISED HOSE ASSEMBLIES.

96V143001Service Brakes, Hydraulic:Foundation Components:Hoses, Lines/Piping, And FittingsReported 25/07/1996

UNDER CONDITIONS OF FULL LOCK STEERING AND FULL SUSPENSION TRAVEL, THE LEFT OR RIGHT FRONT WHEEL-SIDE BRAKE HOSE CAN CRACK, RESULTING IN BRAKE FLUID LEAKAGE. Remedy: DEALERS WILL REPLACE THE LEFT AND RIGHT FRONT WHEEL-SIDE BRAKE HOSES WITH REVISED HOSE ASSEMBLIES.

Technical service bulletins NHTSA · verified

Showing 5 of 17 bulletins on record with NHTSA.

BulletinDateComponentSummary
TSB-22-54-0032022-04-07Exterior LightingThis Technical Service Bulletin was sent to dealers to explain the difference between…
TT2532019-11-26EquipmentThis is a service newsletter (Tech Talk) that was sent out to dealers.
TSB-19-00-0082019-07-30EquipmentThis is a Technical Service Bulletin sent to dealers. This bulletin supersedes…
TT2372018-02-26EquipmentThis is a service newsletter (Tech Talk) that was sent out to dealers.
TSB-13-42A-0022013-01-29StructureThis Technical Service Bulletin updates the door adjustment procedure in the Body Section…

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 Diamante. 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

How much oil does the 1994 Diamante 3.0L take?

4.2 qt of ABOVE 32 degrees F: 20W-40 API, ABOVE -10 degrees F: 10W-30 API, BELOW 60 degrees F 5W-30 API, per the factory manual.

Does the 1994 Diamante have open recalls?

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

What gas mileage does the 3.0L get?

EPA figures are 16 city / 22 highway / 18 combined mpg.