HyundaiSonata1991Overview/hyundai/sonata/1991/base/

1991 Hyundai Sonata

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

The 1991 Hyundai Sonata is equipped with an engine that requires 4.2 qt of oil and is approved for viscosities of 20W‑40, 20W‑50, or 10W‑30 API. In its early years it generated only 45 total owner complaints, with seat‑belt problems accounting for the majority and a single recall recorded. Situated at the beginning of a complaint timeline that spans 1990 to 2026, the 1991 model falls within the period of comparatively low complaint volume, preceding the sharp peak of 3,368 complaints in 2011 and declining to just two complaints by 2026.

Model year202520242023202220212020201920181991

Quick specs

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

Engine oil capacity4.2 qtOEM · verified
Engine oil type20W-40 / 20W-50 / 10W-30 APIOEM · verified

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length184.3 in
Overall width68.9 in
Overall height55.5 in
Wheelbase104.3 in
Curb weight2703 lb
Weight distribution (front / rear)61/39

Performance & power Independent road tests

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

Independent road tests for the Sonata of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

9.9–10.5 sec0–60 mph (tested)quickest 9.90 sec — 1990 GLS V6
YearTrim / engine0–60¼ mileHPDrivetrain
1990GLS V6 3.0L V69.90 sec17.20 sec143 hpFWD
1989GLS 2.4L I-410.50 sec17.30 secFWD

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 / 20W-50 / 10W-30 API engine oil.

Lubricants & capacities

Engine CoolantETHYLENE GLYCOL
Engine OilABOVE 32 degrees F
Engine Oil Capacity4.2 qt
Engine OilABOVE 32 degrees F
Engine Oil Capacity3.7 qt
Power Steering FluidATF

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; 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 miBrake System (inspect)
Every 7,500 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
At 15,000 miAxle Shaft Oil Seal (inspect) · Brake Hydraulic System (inspect fluid level) · CV Joint Boot (inspect) · Jet Valve (inspect) · Power Steering System (inspect)
Every 15,000 miAxle Shaft Oil Seal (inspect) · Brake Hydraulic System (inspect fluid level) · Brake Line (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Jet Valve (inspect)
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) · Rack & Pinion Assembly (inspect)
Every 52,500 miFuel Evaporative Emission Control System Lines (inspect) · Fuel Filter (replace) · Fuel Line (inspect) · Fuel Tank Filler Cap (inspect) · PCV Hose (inspect) · Vacuum Line (inspect)
Every 60,000 miTiming Belt (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.

In 1991, the Sonata saw a rise in complaints to 45 from 25 in 1990, while recalls fell to just one, indicating a spike in reported issues without a corresponding recall response. The following year, 1992, complaints dipped slightly to 43 but remained high relative to earlier years, and recalls stayed at one, showing a persistent trend of consumer grievances. This period marks the early peak of the generation’s complaint curve, which eventually escalates dramatically in the mid‑2000s before tapering off in recent years. Compared to the low‑complaint years of 1994 (3 complaints) and the high‑complaint surge of 1995 (78 complaints), 1991 sits in the middle of a gradual upward trajectory. The data does not specify root causes, but the top complaint areas—seat belts, electrical system, engine cooling, and power train—suggest recurring mechanical and safety concerns. Given the moderate complaint level and low recall count for 1991, it is a reasonable year to consider, provided a thorough mechanical inspection is performed.

1
Open recalls
NHTSA campaigns
11
Service bulletins
Manufacturer communications
2
ODI investigations
Office of Defects Investigation
45
Owner complaints
3 involved a crash · 6 a fire

Owner complaints filed with NHTSA, by component

All 45 complaints on record, top 8 components.

Seat Belts10
Electrical System8
Engine & Engine Cooling8
Power Train7
Service Brakes, Hydraulic3
Unknown Or Other2
Air Bags1
Engine & Engine Cooling,Power Train,Unknown Or Other1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

93V196000Seat BeltsReported 29/11/1993

THE MOTORIZED SHOULDER BELT CAN TRAVEL SLOWLY OR CHATTER IN THE TRACK AND MAY EVENTUALLY STOP TRACKING AND BECOME INOPERATIVE. Remedy: DEALERS WILL LUBRICATE THE TRACK ASSEMBLY AND, IF ANY SYSTEMS ARE FOUND INOPERATIVE, THE SYSTEM WILL BE REPAIRED OR REPLACED, AS REQUIRED.

Technical service bulletins NHTSA · verified

Showing 5 of 11 bulletins on record with NHTSA.

BulletinDateComponentSummary
23-BD-002H2023-01-30VisibilityThis bulletin provides information regarding condensation related to the accumulated…
21-EM-003H2021-03-10Engine And Engine CoolingThis bulletin provides the inspection procedure and repair guidelines for certain…
20-BR-002H2020-11-30Service BrakesThis bulletin describes the procedure to inspect and identify fluid which may appear…
20-SS-004H2020-11-19WheelsThis bulletin provides tire vibration service procedures, including how to optimize…
20-EE-003H2020-04-23EquipmentThis bulletin provides information on identifying dealer stock vehicles with either: •…

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 Sonata. 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 Sonata take?

4.2 qt of ABOVE 32 degrees F: 20W-40 OR 20W-50 API SM, ABOVE -10 degrees F: 10W-30, 10W-40 OR 10W-50 API SM, BELOW 100 degrees F: 5W-30 OR 5W-40 API SM, per the factory manual.

Does the 1991 Sonata have open recalls?

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