GMC TruckSyclone1991Overview/gmc-truck/syclone/1991/base/

1991 GMC Truck Syclone

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

The 1991 GMC Syclone, a compact pickup built on the standard GMC truck platform, uses 4 quarts of 10W-30 API oil. Its reliability record shows only seven total owner complaints, with the most common issue involving the service brakes, hydraulic system, and no recalls were ever issued for this model year. This low complaint count and clean recall history place the 1991 Syclone as a notably trouble-free entry in the model's timeline, suggesting that its mechanical and electrical systems held up well over time.

Quick specs

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

Engine oil capacity4 qtOEM · verified
Engine oil type10W-30 APIOEM · verified

Service quick specs OEM factory data

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

This engine holds 4 qt of 10W-30 API engine oil, 80W-90 · GL-5 in the differential, DOT 3 brake fluid.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil80W-90 · GL-5
Differential Gear Oil Capacity4.5 qt
Differential Gear Oil80W-90 · GL-5
Differential Gear Oil Capacity10.0 qt
Engine CoolantETHYLENE GLYCOL
Engine OilSYNTHETIC · 10W-30 · API
Engine Oil Capacity4 qt

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 2,500 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 2,500 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
At 6,000 miTire & Wheel Assembly (rotate)
At 7,500 miDrive Axle Assembly (drain & refill)
Every 7,500 miBody Latches, Locks & Hinges (inspect) · Brake Line (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect) · Driveshaft U-Joint (lubricate) · Parking Brake Cable (lubricate)
Every 15,000 miTire & Wheel Assembly (rotate)
Every 30,000 miAccessory Drive Belt (inspect) · Clutch Cross Shaft (lubricate) · EGR System (inspect) · Early Fuel Evaporation System (inspect) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill)
Every 60,000 miIgnition Timing (inspect) · PCV System (inspect) · Spark Plug Wires (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.

Owner complaints about the 1991 GMC Truck Syclone dominate in one area — the service brakes, hydraulic, 4 of 7 reports (57%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 2 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the service brakes, hydraulic pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

0
Open recalls
NHTSA campaigns
0
Service bulletins
Manufacturer communications
1
ODI investigations
Office of Defects Investigation
7
Owner complaints
2 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Frontal★★★★★

Owner complaints filed with NHTSA, by component

All 7 complaints on record, top 4 components.

Service Brakes, Hydraulic4
Service Brakes, Hydraulic,Power Train1
Power Train1
Engine & Engine Cooling1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

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 Syclone. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
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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 Syclone take?

4 qt of SYNTHETIC 10W-30 API MOBIL 1, per the factory manual.

Does the 1991 Syclone have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.