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1991 Chevrolet Astro 4WD

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

The 1991 Chevrolet Astro 4WD takes 4 qt of 5W-30 engine oil.

Model year2004 1991

Quick specs

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

Engine oil capacity4 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque100 ft-lbsOEM · verified

Fitment & sizes

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

From the factory this vehicle uses OE oil filter 12737090. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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	12737090
Engine air filter	25040929 alt 25098766
Fuel filter	25171792 discontinued
Spark plug	19302741
Front wiper blades	15184702
Serpentine belt	88986825 alt 12576753
Thermostat	10207373 alt 10105135

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	176.8 in
Overall width	77.2 in
Overall height	74 in
Wheelbase	111 in
Curb weight	4165 lb

Service quick specs OEM factory data

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

This engine holds 4 qt of 5W-30 API engine oil, 80W-90 · GL-5 in the differential, DOT 3 brake fluid. Torque lug nuts to 100 ft-lbs.

Lubricants & capacities

Brake Fluid	DOT 3
Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	4.0 qt
Engine Oil	API · 5W-30
Engine Oil Capacity	4 qt
Engine Oil	API · 5W-30
Engine Oil Capacity	4.5 qt
Engine Oil	5W-30 · API

Chassis torques

Lug Nuts

100 ft-lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter at 7,500 mi.

At 7,500 mi	Drive Axle Assembly (drain & refill) · Engine Oil Filter (replace) · Throttle Body (torque) · Tire & Wheel Assembly (rotate)
Every 7,500 mi	Accessory Drive Belt (inspect) · Body Latches, Locks & Hinges (inspect) · Brake Line (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect) · Driveshaft U-Joint (lubricate)
Every 15,000 mi	Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 30,000 mi	Clutch Cross Shaft (lubricate) · Clutch Release Lever Pivot Points (lubricate) · EGR System (inspect) · Early Fuel Evaporation System (inspect) · Engine Air Filter Element (replace) · Fuel Evaporative Emission Control System (inspect)
Every 60,000 mi	Fuel Filter (replace) · Fuel Line (inspect) · Fuel Tank (inspect) · Fuel Tank Filler Cap (inspect) · Ignition Timing (inspect) · PCV System (inspect)