Toyota4runner1991L4/toyota/4runner/1991/l4/

1991 Toyota 4runner — L4

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1991 4runner L4.

Body SUVEngine L4Transmission Automatic 4-spd

The 1991 Toyota 4Runner L4 is a sport-utility equipped with an L4 engine and a four-speed automatic transmission, returning an EPA-rated 17/19/18 mpg and specifying 4.4 quarts of either 10W-30 or 5W-30 API engine oil. As a baseline for researcher reference, the model year has drawn 50 total owner complaints over its reporting life, with the engine and engine cooling system standing out as the most cited category and two recalls on file. Within the 4Runner's broader complaint arc from 1990 through 2026, the 1991's modest total sits at the quiet end of the spectrum — well clear of the 2003 peak of 707 complaints and near the 2026 low of 5, positioning this early model year as one of the more dependable entries in the nameplate's reliability history.

Model year200019991998199519941993199219911990

Quick specs

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

Engine oil capacity4.4 qtOEM · verified
Engine oil type10W-30 / 5W-30 APIOEM · verified
EPA fuel economy17/19/18 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 90915YZZD1. 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 filter90915YZZD1
Engine air filter178013502083 alt 178017002083
Fuel filter2330039035 alt 2330065020
Spark plug9091901064
Front wiper blades85212YZZ09TM
Serpentine belt909160219683 alt 909160237883
Thermostat9091603079 alt 9091603078

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined17 / 19 / 18 mpg
DrivetrainRear-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 4.4 qt of 10W-30 / 5W-30 API engine oil, 75W-90 · GL-5 in the differential, DOT 3 brake fluid.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil75W-90 · GL-5
Differential Gear Oil Capacity3.5 Pints
Engine Oil10W-30 · API · 5W-30
Engine Oil Capacity4.4 qt
Engine Oil10W-30 · API · 5W-30
Engine Oil Capacity4.5 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 miUniversal Vehicle Operation (inspect idle speed)
Every 7,500 miAccessory Drive Belt (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 15,000 miAxle Shaft Oil Seal (inspect) · Body Fasteners (torque) · Body Latches, Locks & Hinges (inspect) · Brake Drum Assembly (inspect) · Brake Line (inspect) · Brake Linings (inspect)
At 30,000 miAccessory Drive Belt (inspect) · Universal Vehicle Operation (inspect idle speed)
Every 30,000 miEngine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · Engine Valves (inspect valve lash) · Exhaust System (Complete) (inspect) · Fuel Line (inspect) · Fuel System (inspect)
At 45,000 miEngine Coolant System (drain, flush & refill)
Every 60,000 miFuel Evaporative Canister (inspect) · Fuel Tank Filler Cap O-Ring (inspect)
At 80,000 miOxygen Sensor (inspect)
At 120,000 miAccessory Drive Belt (inspect)

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 1991 model year posts 50 complaints, 2 recalls, 4 investigations, and 31 TSBs — the lowest complaint count anywhere in the first-generation run (1990-1995) and a notable step down from the 85 logged in 1990, while its 4 investigations tie 1990 for the most of any early-year 4Runner. Against the surrounding arc, 1991 sits at the bottom of a shallow valley: complaints drift back up to 68 in 1992, hold in the 55-80 range through 1994, then more than double to 184 in 1995, indicating that 1991 represents an unusually quiet reporting period rather than a structural shift in quality. The complaint profile is concentrated, with Engine & Engine Cooling alone accounting for 19 of the 50 filings (38%) and Service Brakes Hydraulic adding 8, while Steering and Power Train contribute 5 each — and notably, there are zero fire complaints and only 3 crash-related filings in the dataset. TSBs remain in a narrow 29-34 band across 1990-1993, consistent with normal service-bulletin activity rather than an emerging defect pattern, and the data does not specify the root cause behind the engine-cooling concentration. Bottom line: within this generation's record, 1991 is one of the strongest candidates to buy, though a pre-purchase inspection of the cooling system and hydraulic brakes is warranted given their disproportionate share of the year's filings.

2
Open recalls
NHTSA campaigns
31
Service bulletins
Manufacturer communications
4
ODI investigations
Office of Defects Investigation
50
Owner complaints
3 involved a crash · 0 a fire

Owner complaints filed with NHTSA, by component

All 50 complaints on record, top 8 components.

Engine & Engine Cooling19
Service Brakes, Hydraulic8
Steering5
Power Train5
Tires4
Wheels2
Vehicle Speed Control,Service Brakes1
Structure1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

05V389000Steering:Linkages:Rod:Relay:ConnectingReported 06/09/2005

ON CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES, IF THE STEERING WHEEL IS REPEATEDLY TURNED UNDER CERTAIN CONDITIONS WHERE HIGH STEERING EFFORT AND POWER ASSIST ARE REQUIRED, FOR INSTANCE, WHEN FULLY TURNING THE… Remedy: DEALERS WILL REPLACE THE STEERING RELAY ROD. THE RECALL BEGAN OCTOBER 5, 2005. OWNERS MAY CONTACT TOYOTA AT 1-800-331-4331.

06E049000Exterior LightingReported 24/05/2006

CERTAIN CK MOTORSPORTS COMBINATION HEADLIGHTS, CLEAR CORNER, BUMPER, AND SIDE MARKER LIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON THE PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH… Remedy: CK MOTORSPORT WILL NOTIFY OWNERS AND REPLACE THE NONCOMPLIANT LAMPS FREE OF CHARGE. THE RECALL BEGAN ON JULY 1, 2006. OWNERS MAY CONTACT CK MOTORSPORT AT 1-909-610-7211.

Technical service bulletins NHTSA · verified

Showing 5 of 31 bulletins on record with NHTSA.

BulletinDateComponentSummary
TSB0032202023-08-17Air BagsTSB: Replacement certification labels (the vinyl label installed on the driver door or…
Toyota PRO19-022022-01-12TiresPOL: This consolidated Tire Warranty Guide contains the complete warranty terms for all…
T-SB-0032-20 Rev2021-02-03EquipmentTSB: Replacement certification labels (the vinyl label installed on the driver door or…
T-SB-0304-17 Obs2020-04-07EquipmentTSB: OBSOLETE NOTICE April 07, 2020: This bulletin is now obsolete. Please see…
T-SB-0032-202020-04-06EquipmentTSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service…

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

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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 4runner L4 take?

4.4 qt of ABOVE 0 degrees F: 10W-30 API, BELOW 50 degrees F: 5W-30 API, per the factory manual.

Does the 1991 4runner have open recalls?

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

What gas mileage does the L4 get?

EPA figures are 17 city / 19 highway / 18 combined mpg.