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1998 Chevrolet Astro 4WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1998 Astro 4WD.

Transmission Automatic 3-spd

The 1998 Chevrolet Astro 4WD takes 4.5 qt of 5W-30 engine oil and is EPA-rated at 20/23/21 mpg city/highway/combined.

Model year1998 1996

Quick specs

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

Engine oil capacity4.5 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque100 ft-lbsOEM · verified

EPA fuel economy20/23/21 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 19210286. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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.

Battery groupBCI 78 · 600 CCAOEM · verified

Tire sizeP215-75R15OEM · verified

Wheel / rim6-, 6.5-JJ; 6.5-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	19210286
Engine air filter	19259086
Fuel filter	25171792 discontinued
Spark plug	12681665
Front wiper blades	15184702
Serpentine belt	12576572 alt 19355374
Thermostat	12632948 alt 12551507

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 3-spd

Dimensions & weight NHTSA vPIC

Overall length	189.8 in
Overall width	77.6 in
Overall height	74.4 in
Wheelbase	111.4 in
Curb weight	3964 lb
Track (front / rear)	65 / 65.4 in

Ratings & economy EPA / vPIC

EPA city / highway / combined	20 / 23 / 21 mpg
Drivetrain	4-Wheel or All-Wheel Drive
Recommended fuel	Regular Gasoline

Service quick specs OEM factory data

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

This engine holds 4.5 qt of 5W-30 API engine oil, 80W-90 · GL-5 in the differential. Torque lug nuts to 100 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-6-5-4-3-2.

Lubricants & capacities

Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	4.5 qt
Engine Oil	5W-30 · API
Engine Oil Capacity	4.5 qt

Engine torques

Crankshaft Pulley and/or Damper Bolts	74 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Valve Cover Bolts	8.85 ft-lbs

Chassis torques

Leaf Spring to Axle (U-bolts)	74.0 ft-lbs
Leaf Spring to Chassis Bracket	74.0 ft-lbs
Leaf Spring to Rear Shackle	74.0 ft-lbs
Leaf Spring Rear Shackle to Chassis Bracket	103.0 ft-lbs
Lug Nuts	100 ft-lbs
Transfer Case Fill Plug	18.0 ft-lbs
Transfer Case Drain Plug	18.0 ft-lbs
Front Wheel Hub	147 ft-lbs

Ignition

Cylinder Firing Order	1-6-5-4-3-2
Spark Plug Manufacturer	AC Delco
Spark Plug Gap	0.060 in
Spark Plug Torque	11-14 ft-lbs

Battery & A/C

Refrigerant	R134a
Oil Group	PAG
Oil Type	46
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca

Service checks

Pressure Test	20 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	188-206 °F
Fuel Pump Pressure Minimum	66.0 psi
Key ON Engine OFF (KOEO)	60-66
RPM	50-63 @ Idle rpm
Engine Compression	100
Engine Compression	100 Minimum psi

Brakes

Torque to Knuckle	38 ft-lbs
Torque to Knuckle	38 ft-lbs
Minimum Pad Thickness	Front: 0.030; Rear: 0.030 specification
Rotor Max Parallel Variation	0.0005 in
Rotor Runout Limit	0.003 in
Rotor Nominal Thickness From	1.04 in
Rotor Nominal Thickness To	1.04 in
Rotor Minimum Machining	0.98 in

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi.

Every 7,500 mi	Accessory Drive Belt (inspect) · Axle Shaft Oil Seal (inspect) · Body Latches, Locks & Hinges (inspect) · Brake Pedal Assembly (lubricate return spring) · CV Joint Boot (inspect) · Clutch Pedal Bushing (lubricate)
Every 30,000 mi	Engine Air Filter Element (replace) · Fuel Filter (replace) · Wheel Bearing (inspect)
Every 50,000 mi	Transmission Fluid & Filter (replace)
Every 60,000 mi	Fuel Line (inspect) · Fuel Tank (inspect) · Fuel Tank Filler Cap (inspect)
Every 100,000 mi	PCV Valve (inspect) · Spark Plug Wires (inspect) · Spark Plugs (replace)

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 Astro 4WD. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 78 battery Vehicles taking 4.5 qt Engine oil filter 19210286 Engine air filter 19259086 Fuel filter 25171792 Spark plug 12681665

Reference guides

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

OBD-II trouble codes Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 1998 Astro 4WD take?

4.5 qt of 5W-30 API, per the factory manual.

What gas mileage does the Astro 4WD get?

EPA figures are 20 city / 23 highway / 21 combined mpg.