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1985 GMC Truck Suburban 4WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1985 Suburban 4WD.

The 1985 GMC Truck Suburban 4WD, a full-size SUV built on a truck platform, requires 6 quarts of engine oil with recommended viscosities of 20W-20, 15W-40, or 5W-30. With only six total owner complaints on record—the most common being service brake hydraulic issues—and zero recalls, this model year stands out as exceptionally trouble-free. In the broader model’s reliability history, which from 1990 to 2004 saw a peak of 480 complaints in 1994 and a low of just one in 2004, the 1985 Suburban’s minimal complaint count and clean recall record place it among the most dependable years of the generation.

Model year1992 1986 1985

Quick specs

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

Engine oil capacity6 qtOEM · verified

Engine oil type20W-20 / 15W-40 / 5W-30OEM · 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 Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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 08997890
Fuel filter	5651803 discontinued · alt 25011765
Spark plug	19300382
Front wiper blades	15184702
Serpentine belt	09433734 alt 09433722
Thermostat	14077122 alt 10105135

Service quick specs OEM factory data

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

This engine holds 6 qt of 20W-20 / 15W-40 / 5W-30 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	4.2 qt
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	42.0 qt
Engine Coolant	ETHYLENE GLYCOL

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 15,000 mi.

At 5,000 mi	Drive Axle Assembly (drain & refill) · Exhaust Pressure Regulator (inspect)
Every 5,000 mi	Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Exhaust System (Complete) (inspect) · Suspension System (inspect)
At 7,500 mi	Choke System (inspect) · Distributor Vacuum Advance (inspect) · Early Fuel Evaporation System (inspect) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate) · Universal Vehicle Operation (inspect idle speed)
Every 7,500 mi	Brake Line (inspect) · Brake Linings (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Parking Brake Cable (lubricate) · Parking Brake System (inspect)
Every 10,000 mi	Accessory Drive Belt (inspect) · Air Intake System (inspect) · Radiator Fan Assembly (inspect)
Every 15,000 mi	Driveshaft U-Joint (lubricate) · Engine Oil Filter (replace) · Exhaust Pressure Regulator (inspect) · PCV System (inspect) · Spark Plug Wires (inspect) · Steering Linkage (lubricate)
Every 30,000 mi	Carburetor Mounting Fasteners (inspect) · Choke System (inspect) · Clutch Cross Shaft (lubricate) · Distributor Assembly (inspect) · Distributor Vacuum Advance (inspect) · EGR System (inspect)
Every 45,000 mi	Distributor Vacuum Advance (inspect)
Every 60,000 mi	Universal Vehicle Operation (inspect idle speed)

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 1985 GMC Truck Suburban 4WD dominate in one area — the service brakes, hydraulic, 3 of 6 reports (50%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 0 of the reports describe a crash and 1 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.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 1 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’90 ’91 ’92 ’93 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02 ’03 ’04

Owner complaints filed with NHTSA, by component

All 6 complaints on record, top 4 components.

Service Brakes, Hydraulic3

Engine & Engine Cooling1

Trailer Hitches1

Seats1

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.

Technical service bulletins NHTSA · verified

Showing 1 of 1 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
376602A	1995-01-01	Engine And Engine Cooling	NEW CAST IRON EXHAUST MANIFOLD AND STAINLESS STEEL GASKET TO CORRECT ENGINE NOISE…

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 Suburban 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.

Vehicles taking 6 qt Engine oil filter 25160561 Engine air filter 08996118 Fuel filter 5651803 Spark plug 19300382

Reference guides

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

Vehicle recalls & TSBs OBD-II trouble codes Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 1985 Suburban 4WD take?

6 qt of ABOVE 40 degrees F: 30, ABOVE 20 degrees F: 20W-20, ABOVE 10 degrees F: 15W-40, BELOW 60 degrees F: 5W-30, per the factory manual.

Does the 1985 Suburban 4WD have open recalls?

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