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1989 GMC Truck R-Series Truck

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1989 R-Series Truck.

The 1989 GMC Truck R-Series Truck 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

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses OE oil filter 25160561. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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 filter	25160561
Engine air filter	08996118 alt 06484235
Fuel filter	25171792 discontinued · alt 25011765
Spark plug	19302741
Front wiper blades	15184702 alt 12363297
Serpentine belt	14087540 alt 09433764
Thermostat	14077122 alt 10105135

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 Fluid	DOT 3
Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	14.0 qt
Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	4.9 qt
Engine Coolant	ETHYLENE GLYCOL
Engine Oil	5W-30 · API · 10W-30
Engine Oil Capacity	5 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; spark plugs every 12,000 mi.

At 5,000 mi	Drive Axle Assembly (drain & refill)
Every 5,000 mi	Brake System (inspect) · Engine Oil Filter (replace) · Shift Linkage (lubricate) · Steering System (inspect) · Suspension System (inspect) · Throttle Linkage (inspect)
At 6,000 mi	Drive Axle Assembly (drain & refill) · Engine Oil Filter (replace)
Every 6,000 mi	Body Latches, Locks & Hinges (inspect) · Brake Line (inspect) · Brake Linings (inspect) · Differential (inspect fluid level) · Engine Oil (drain & refill) · Exhaust System (Complete) (inspect)
At 7,500 mi	Tire & Wheel Assembly (rotate)
Every 12,000 mi	Accessory Drive Belt (inspect) · Air Cleaner Manifold Heat Control Actuator (inspect) · Engine Oil Filter (replace) · Radiator Fan Assembly (inspect) · Spark Plugs (replace) · Underbody Splash Shield (inspect)
Every 15,000 mi	CV Joint Boot (inspect) · Driveshaft U-Joint (lubricate) · Tire & Wheel Assembly (rotate)
At 24,000 mi	Universal Vehicle Operation (inspect idle speed)
Every 24,000 mi	Air Intake System (inspect) · Carburetor Mounting Fasteners (inspect) · Drive Axle Assembly (drain & refill) · EGR System (inspect) · Early Fuel Evaporation System (inspect) · Engine Air Filter Element (replace)