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1985 Buick Century

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

The 1985 Buick Century employs a 3‑quart oil capacity and is designed for 20W‑20, 10W‑30, or 10W‑40 viscosity grades. In its early years it logged only 11 owner complaints and a single recall, positioning it well before the complaint surge that began in the 1990s, when annual complaints peaked at 252 in 1999 and dropped to 19 by 2005. This early record indicates the 1985 model year enjoyed comparatively strong reliability within the Century’s history.

Model year2005 2004 2003 2002 2001 2000 1999 1998 1985

Quick specs

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

Engine oil capacity3 qtOEM · verified

Engine oil type20W-20 / 10W-30 / 10W-40OEM · verified

Fitment & sizes

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

From the factory this vehicle uses OE oil filter 12731175. 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	12731175 alt 12737090
Engine air filter	25043317 alt 06483645
Fuel filter	22522452 alt 25171792
Spark plug	19310656 alt 05614046
Front wiper blades	15184702
Serpentine belt	10034799 alt 9433837
Thermostat	10207373 alt 10101864

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	189 in
Overall width	67.7 in
Overall height	53.5 in
Wheelbase	104.7 in
Curb weight	2694 lb
Weight distribution (front / rear)	63/37

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the Century of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

9.1–11.5 sec0–60 mph (tested)quickest 9.10 sec — 1979 Turbo Coupe

Year	Trim / engine	0–60	¼ mile	HP	Drivetrain
1986	T-Type Sedan 3.8L V6	11.50 sec	17.60 sec	150 hp	FWD
1979	Turbo Coupe 3.8L Turbo V6	9.10 sec	17.40 sec	165 hp	RWD

Service quick specs OEM factory data

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

This engine holds 3 qt of 20W-20 / 10W-30 / 10W-40 engine oil, DOT 3 brake fluid.

Lubricants & capacities

Brake Fluid	DOT 3
Engine Coolant	ETHYLENE GLYCOL
Engine Oil	ABOVE 40 degrees F
Engine Oil Capacity	3 qt
Engine Oil	ABOVE 40 degrees F
Engine Oil Capacity	4 qt
Engine Oil	ABOVE 40 degrees F
Engine Oil Capacity	4 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.

At 5,000 mi	Exhaust Pressure Regulator (inspect) · Universal Vehicle Operation (inspect idle speed)
Every 5,000 mi	Accessory Drive Belt (inspect) · Axle Shaft Oil Seal (inspect) · CV Joint Boot (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Exhaust System (Complete) (inspect)
At 7,500 mi	Carburetor Mounting Fasteners (inspect) · Choke System (inspect) · Engine Oil Filter (replace) · Throttle Body (torque) · Tire & Wheel Assembly (rotate)
Every 7,500 mi	Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · Carburetor Mounting Fasteners (inspect) · Parking Brake Cable (lubricate) · Steering Linkage (inspect) · Steering System (inspect)
Every 15,000 mi	Engine Oil Filter (replace) · Exhaust Pressure Regulator (inspect) · PCV System (inspect) · Tire & Wheel Assembly (rotate)
Every 30,000 mi	Choke System (inspect) · Diesel Fuel Injection Pump Timing (inspect) · Distributor Cap (inspect) · Distributor Vacuum Advance (inspect) · EGR System (inspect) · Engine Air Filter Element (replace)
Every 100,000 mi	Transmission Fluid & Filter (replace)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 1985 Buick Century sits just before the data set’s earliest year, 1990, but its complaint profile—four steering, three engine‑cooling, two service‑brake, and one vehicle‑speed‑control issues—mirrors the steady, low‑level pattern that begins in 1990 and continues through 1995, where complaints range from 46 to 147. After 1995 the numbers climb sharply, peaking at 251 complaints in 1998, then decline to the single‑digit complaints of 2005, showing a pronounced rise‑fall trend over the decade. The 1985 model’s two fire complaints and zero crash complaints are lower than the average of the 1990‑1995 period (which averaged 3–5 complaints per year), suggesting fewer critical safety failures. Compared with the adjacent years in the trend, the 1985 Century falls on the early, relatively stable end of the arc, implying it likely shares the modest issue levels seen in the early 1990s. For a buyer, this means 1985 is a solid choice, offering a vehicle that historically had fewer serious complaints than later years in the same generation.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 2 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’90 ’91 ’92 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02 ’03 ’04 ’05

Owner complaints filed with NHTSA, by component

All 11 complaints on record, top 5 components.

Steering4

Engine & Engine Cooling3

Service Brakes, Hydraulic2

Vehicle Speed Control1

Electrical System1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

06E043000Fuel System, GasolineReported 19/05/2006

CERTAIN REPLACEMENT FUEL FILTERS, FRAM BRAND NAME P/N G3727, WITH DATE CODES X52911 THROUGH X60801 SEQUENTIALLY OR X600141 AND A MEXICO COUNTRY OR ORIGIN MARKING ON THE FUEL FILTER HOUSING MANUFACTURED FROM OCTOBER 18… Remedy: HONEYWELL WILL NOTIFY OWNERS AND REPLACE THE FUEL FILTERS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 18, 2006. OWNERS MAY CONTACT FRAM CUSTOMER SERVICE AT 1-800-890-2075 (OPTION…

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 Century. 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 3 qt Engine oil filter 12731175 Engine air filter 25043317 Fuel filter 22522452 Spark plug 19310656

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 Century take?

3 qt of ABOVE 40 degrees F: 30, ABOVE 20 degrees F: 20W-20, 10W-30, 10W-40, 20W-40 OR 20W-50, ABOVE 10 degrees F 15W-40, BELOW 20 degrees F: 5W-20 OR 5W-30, per the factory manual.

Does the 1985 Century have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.