GeoStorm1991Overview/geo/storm/1991/base/

1991 Geo Storm

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

Body PASSENGER CARTransmission Automatic 3-spd

The 1991 Geo Storm was a passenger car that debuted as the first model year of this sporty compact, built on GM's Gamma platform and powered by a powerplant requiring 4.6 quarts of oil (10W-30 or 5W-30 API grade); fuel economy was rated by the EPA at 21 mpg city, 29 mpg highway, and 24 mpg combined, paired with a three-speed automatic transmission, and the model carried two safety recalls. This inaugural model year proved to be the least reliable iteration across the Storm's 1990-1995 run, generating 98 owner complaints—the highest in the model's history—with engine and cooling issues constituting the primary problem area, a stark contrast to 1995 when complaints fell to just 2, indicating substantial quality improvements as the vehicle matured.

Model year199319921991

Quick specs

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

Engine oil capacity4.6 qtOEM · verified
Engine oil type10W-30 / 5W-30 APIOEM · verified
EPA fuel economy21/29/24 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 25161877. Note the factory fuel filter and front wiper blades are now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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.

OE service part numbers OEM · verified

Engine oil filter25161877 alt 25013451
Engine air filter25322205
Fuel filter25121160 discontinued
Spark plug94328372 alt 19302733
Front wiper blades12363388 discontinued
Serpentine belt94137478 alt 94364580
Thermostat94336069 alt 94457048

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 3-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined21 / 29 / 24 mpg
DrivetrainFront-Wheel Drive
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

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

This engine holds 4.6 qt of 10W-30 / 5W-30 API engine oil, DOT 3 brake fluid.

Lubricants & capacities

Brake FluidDOT 3
Engine CoolantETHYLENE GLYCOL
Engine OilAPI · 10W-30 · 5W-30
Engine Oil Capacity4.6 qt
Power Steering FluidUSE GM PART NO. 1052884 OR EQUIVALENT

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter at 7,500 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.

At 7,500 miEngine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 7,500 miBody Latches, Locks & Hinges (inspect) · Clutch Release Lever Pivot Points (lubricate) · Engine Oil (drain & refill) · Exhaust System (Complete) (inspect) · Steering System (inspect) · Suspension System (inspect)
Every 15,000 miBrake System (inspect) · Engine Oil Filter (replace) · Fuel Line (inspect) · Fuel Tank (inspect) · Fuel Tank Filler Cap (inspect) · Tire & Wheel Assembly (rotate)
Every 22,500 miPower Steering System (drain & refill)
Every 30,000 miAccessory Drive Belt (inspect) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · Oxygen Sensor (inspect) · PCV Hose (inspect) · PCV System (inspect)
Every 45,000 miPower Steering Line (replace)
Every 60,000 miEngine Valves (inspect valve lash) · Timing Belt (replace)
Every 100,000 miTransmission Assembly (drain & 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.

For the 1991 Geo Storm, the federal record shows a sharp escalation from the debut year: complaints nearly doubled from 1990's 50 to 98 in 1991, matching 1992's volume and establishing the model's peak complaint period before volume tapered to 63 in 1993 and 2 in 1995. Recall activity was moving in the opposite direction, with three recalls in 1990, two in 1991, one in 1992, and none thereafter, while investigations held steady at two in 1990-1991 before disappearing entirely. The 1991 model sits at the leading edge of the highest complaint concentration, reporting the top categories as Engine & Engine Cooling (18), Electrical System (17), Air Bags (14), and Vehicle Speed Control (12), plus 25 crash-related and one fire-related complaint, though the data does not specify root causes. Given that 1991 shares the generation-worst complaint count with 1992 while still carrying two recalls and two investigations, it is not the strongest choice within this generation; a later 1993 example, with fewer complaints and no recalls or investigations, would present a more favorable risk profile.

2
Open recalls
NHTSA campaigns
2
Service bulletins
Manufacturer communications
2
ODI investigations
Office of Defects Investigation
98
Owner complaints
25 involved a crash · 1 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 98 complaints on record, top 8 components.

Engine & Engine Cooling18
Electrical System17
Air Bags14
Vehicle Speed Control12
Steering11
Seat Belts6
Unknown Or Other3
Structure3

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

92V091001Air BagsReported 06/07/1992

THE STEERING WHEEL CENTER HUB CAN FRACTURE DURING CERTAIN FRONTAL AND NEAR FRONTAL VEHICLE COLLISIONS. Remedy: A STEERING WHEEL REINFORCEMENT PLATE AND NUT WILL BE ADDED TO THE STEERING WHEEL HUB.

95V103007Seat Belts:Front:Buckle AssemblyReported 24/05/1995

THE FRONT SAFETY BELT BUCKLE RELEASE BUTTONS CAN BREAK. THESE RED PLASTIC RELEASE BUTTONS ARE MARKED "PRESS." IF A BUTTON BREAKS, PIECES CAN FALL INTO THE BUCKLE ASSEMBLY CAUSING THE BUCKLE TO OPERATE IMPROPERLY. Remedy: OWNERS SHOULD PROMPTLY CHECK THE CONDITION AND OPERATION OF BOTH FRONT SAFETY BELT BUCKLES AND CAREFULLY INSPECT THE RED RELEASE BUTTON FOR ANY BREAKS OR CRACKS. THEY SHOULD…

Technical service bulletins NHTSA · verified

Showing 2 of 2 bulletins on record with NHTSA.

BulletinDateComponentSummary
1300890092013-09-01Engine And Engine CoolingExpanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
MSG011451995-05-01Seat BeltsUNKNOWN

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 Storm. 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 Storm take?

4.6 qt of ABOVE 40 degrees F 30W API, ABOVE 0 degrees F 10W-30 API, ALL TEMPERATURES 5W-30 API, per the factory manual.

Does the 1991 Storm have open recalls?

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

What gas mileage does the Storm get?

EPA figures are 21 city / 29 highway / 24 combined mpg.