GMC TruckR2500 Suburban1990Overview/gmc-truck/r2500-suburban/1990/base/

1990 GMC Truck R2500 Suburban

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1990 R2500 Suburban.

The 1990 GMC Truck R2500 Suburban takes 5 qt of 5W-30 engine oil.

Quick specs

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

Engine oil capacity5 qtOEM · verified
Engine oil type5W-30 / 10W-30 APIOEM · verified

Service quick specs OEM factory data

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

This engine holds 5 qt of 5W-30 / 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 Capacity14.0 qt
Differential Gear Oil80W-90 · GL-5
Differential Gear Oil Capacity4.9 qt
Engine CoolantETHYLENE GLYCOL
Engine Oil5W-30 · API · 10W-30
Engine Oil Capacity5 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 5,000 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.

At 5,000 miTire & Wheel Assembly (rotate) · Universal Vehicle Operation (inspect idle speed)
Every 5,000 miBrake Hydraulic System (inspect fluid level) · Brake System (inspect) · Driveshaft U-Joint (lubricate) · Engine Oil Filter (replace) · Parking Brake Cable (lubricate) · Power Steering System (inspect)
At 7,500 miDrive Axle Assembly (drain & refill) · Engine Oil Filter (replace)
Every 7,500 miBody Latches, Locks & Hinges (inspect) · Brake Line (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Engine Oil (drain & refill)
Every 10,000 miAir Intake System (inspect) · Radiator Fan Assembly (inspect) · Tire & Wheel Assembly (rotate) · Underbody Splash Shield (inspect)
Every 15,000 miEngine Oil Filter (replace)
Every 30,000 miClutch Cross Shaft (lubricate) · Clutch Release Lever Pivot Points (lubricate) · EGR System (inspect) · Engine Air Filter Element (replace) · Engine Breather Filter (replace) · Engine Coolant System (drain, flush & refill)
Every 60,000 miAccessory Drive Belt (inspect) · Crankcase Depression Regulator Valve (inspect) · Exhaust Pressure Regulator (inspect) · Fuel Filter (replace) · Fuel Line (inspect) · Fuel Tank (inspect)

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

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Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 1990 R2500 Suburban take?

5 qt of LIGHT DUDY MODELS: 5W-30 API, HEAVY DUTY MODELS: 10W-30 API, per the factory manual.