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1985 Oldsmobile Ninety Eight

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

The 1985 Oldsmobile Ninety Eight takes 4 qt of 20W-20 engine oil.

Model year1994 1986 1985

Quick specs

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

Engine oil capacity4 qtOEM · verified

Engine oil type20W-20 / 20W-40 / 20W-50OEM · 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. Note the factory serpentine belt is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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	12731175 alt 12737090
Engine air filter	08994941 alt 25041208
Fuel filter	22522452 alt 25011603
Spark plug	19310656
Front wiper blades	22155381
Serpentine belt	09433741 discontinued · alt 09433743
Thermostat	10207381 alt 10207373

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	196.1 in
Overall width	72 in
Overall height	55.1 in
Wheelbase	111 in
Curb weight	3232 lb
Weight distribution (front / rear)	64/36

Service quick specs OEM factory data

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

This engine holds 4 qt of 20W-20 / 20W-40 / 20W-50 engine oil, DOT 3 brake fluid.

Lubricants & capacities

Brake Fluid	DOT 3
Engine Coolant	ETHYLENE GLYCOL
Engine Oil	20W-20 · 20W-40 · 20W-50 · 15W-40 · 10W-30 · 10W-40 · 5W-30
Engine Oil Capacity	4 qt
Engine Oil	20W-20 · 20W-40 · 20W-50 · 15W-40 · 10W-30 · 10W-40 · 5W-30
Engine Oil Capacity	4 qt
Engine Oil	API · 15W-30 · 10W-30
Engine Oil Capacity	6 qt

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 5,000 mi	Exhaust Pressure Regulator (inspect)
Every 5,000 mi	Fuel Filter Water Separator (inspect) · Universal Vehicle Operation (inspect idle speed)
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	Axle Shaft Oil Seal (inspect) · Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace)
Every 15,000 mi	Engine Oil Filter (replace) · Exhaust Pressure Regulator (inspect) · Tire & Wheel Assembly (rotate)
Every 30,000 mi	Accessory Drive Belt (inspect) · Choke System (inspect) · Diesel Fuel Injection Pump Timing (inspect) · Distributor Cap (inspect) · EGR System (inspect) · Engine Air Filter Element (replace)
Every 100,000 mi	Transmission Fluid & Filter (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 Ninety Eight. 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 4 qt Engine oil filter 12731175 Engine air filter 08994941 Fuel filter 22522452 Spark plug 19310656

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 1985 Ninety Eight take?

4 qt of ABOVE 40 degrees F: 30, ABOVE 20 degrees F: 20W-20, 20W-40, 20W-50, ABOVE 10 degrees F: 15W-40, ABOVE 0 degrees F: 10W-30 OR 10W-40, BELOW 60 degrees F: 5W-30, per the factory manual.