JeepComanche1991Overview/jeep/comanche/1991/base/

1991 Jeep Comanche

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1991 Comanche.

The 1991 Jeep Comanche sits in the middle of the model’s 1990–1992 complaint history, and its engine maintenance specification calls for 4 quarts of oil with the filter, using 20W-40, 20W-50, or 10W-40 API viscosity grades. Reliability records for 1991 list 6 owner complaints and 1 recall, with the parking brake area drawing the most reports. That places the year between the 1990 high of 14 complaints and the 1992 low of 2, meaning 1991 generated fewer reported issues than the launch year but more than the final year of the three-year span.

Model year199119901989198819871986

Quick specs

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

Engine oil capacity4 qt w/ filterOEM · verified
Engine oil type20W-40 / 20W-50 / 10W-40 APIOEM · verified

Service quick specs OEM factory data

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

This engine holds 4 qt w/ filter of 20W-40 / 20W-50 / 10W-40 API engine oil, 75W-90 · GL-5 · 80W-90 in the differential, DOT 3 brake fluid.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil75W-90 · GL-5 · 80W-90
Differential Gear Oil Capacity3 Pints,
Differential Gear Oil75W-90 · GL-5 · 80W-90
Differential Gear Oil Capacity2.5 Pints
Engine CoolantHOAT · MS9769
Engine Oil20W-40 · 20W-50 · API · 10W-40 · 5W-30
Engine Oil Capacity4 qt w/ filter

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 7,500 mi. The big-interval services (every 7,500 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 miCV Joint Boot (inspect) · Differential (inspect fluid level) · Driveshaft U-Joint (lubricate) · Engine Coolant System (leak inspection) · Engine Oil (drain & refill) · Engine Oil Filter (replace)
Every 30,000 miBands (adjust) · Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · Drive Axle Assembly (drain & refill) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill)
At 52,500 miEngine Coolant System (drain, flush & refill)
Every 60,000 miAccessory Drive Belt (inspect) · Battery (replace) · Distributor Cap (inspect) · Distributor Rotor (inspect) · Spark Plug Wires (replace) · Vacuum Line (inspect)
Every 82,500 miOxygen Sensor (replace)

Owner how-tos

Condensed service procedures for routine maintenance. Procedures that require dealer diagnostic equipment are identified and summarized only.

Common procedures

Key fob — remote (RKE) programming programming new fob buttons Dealer tool OEM · verified
Tool requiredDRBIII scan tool (dealer / locksmith)
WhyTransmitter codes are written into the receiver in the passenger door module
Anti-theft (SKIS) — module initialization after immobilizer module replacement Dealer tool OEM · verified
When neededAfter Sentry Key Immobilizer Module (SKIM) replacement
Tool requiredDRBIII scan tool
Also requiredThe vehicle's four-digit PIN code

Reliability & federal safety record

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

In 1990 the Comanche recorded 14 complaints and 2 recalls, while 1992 saw only 2 complaints and no recalls. The 1991 model year falls between these extremes, with 6 complaints and 1 recall, reflecting a downward trend. Technical service bulletins remained steady at 10 in 1990‑1991 before dropping to 9 in 1992, indicating consistent manufacturer communication. Complaint areas for 1991 include parking brake and structure (each 2 reports), with fewer reports for hydraulic service brakes and seat belts. Given the declining complaint and recall trajectory, the 1991 Jeep Comanche represents a comparatively safer purchase than the 1990 model, though slightly less favorable than the 1992 iteration.

1
Open recalls
NHTSA campaigns
10
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
6
Owner complaints
1 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 6 complaints on record, top 4 components.

Parking Brake2
Structure2
Service Brakes, Hydraulic1
Seat Belts1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

98V005000Service Brakes, Hydraulic:Foundation Components:Disc:RotorReported 12/01/1998

VEHICLE DESCRIPTION: PASSENGER AND MULTI-PURPOSE VEHICLES ORIGINALLY SOLD OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, ILLINOIS, INDIANA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, NEW HAMPSHIRE, NEW JERSEY, NEW… Remedy: DEALERS WILL REPLACE THESE ROTORS WITH ROTORS THAT ARE COATED WITH A CORROSION PROTECTION.

Technical service bulletins NHTSA · verified

Showing 5 of 10 bulletins on record with NHTSA.

BulletinDateComponentSummary
21006012001-03-16Power TrainAUTOMATIC TRANSMISSION FLUID USAGE ATF+4. *TT *MJ
0800600REV2000-12-29Electrical SystemSUBJECT REGARDING WIRE SPLICE REPAIRS. *SB
0806002000-02-25Electrical SystemTHIS BULLETIN PROVIDES A REVISED WIRE SPLICE PROCEDURE AND RELATED PARTS. *TT
1107981998-12-11Engine And Engine CoolingOUTER EXHAUST MANIFOLD STUDS MAY FATIGUE/BREAK. *AK
1107981998-07-31Engine And Engine CoolingTHE OUTER EXHAUST MANIFOLD STUDS MAY FATIGUE AND BREAK. *YC

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 Comanche. 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 1991 Comanche take?

4 qt w/ filter of ABOVE 30 degrees F: 20W-40 OR 20W-50 API, ABOVE 0 degrees F: 10W-40 API, BELOW 60 degrees F: 5W-30 API, per the factory manual.

Does the 1991 Comanche have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.