Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1984 Cougar.
The 1984 Mercury Cougar specifies a 4.0-quart oil capacity with viscosity options of 5W-30, 10W-30, or 10W-40, maintenance figures that accompany a reliability profile anchored by just 20 owner complaints and one recall, with the electrical system standing out as the primary concern. Set against the model’s 1990–2002 complaint history—a range that spiked to 521 reports in 1999 and hit a low of one in 1998—this model year’s significantly lower complaint count places it in a comparatively stable period of the vehicle’s documented reliability timeline. This standing reflects markedly fewer reported problems than the volumes recorded during that later span.
Fluid capacities, tune-up values and fuel economy at a glance.
Engine, drivetrain, dimensions and economy.
| Overall length | 197.6 in |
| Overall width | 71.3 in |
| Overall height | 53.5 in |
| Wheelbase | 103.9 in |
| Curb weight | 3097 lb |
| Weight distribution (front / rear) | 56/44 |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 4.0 qt of 5W-30 / 10W-30 / 10W-40 engine oil, DOT 3 brake fluid.
| Brake Fluid | DOT 3 |
| Engine Coolant | ETHYLENE GLYCOL |
| Engine Oil | 5W-30 · 10W-30 · 10W-40 · 15W-40 · 20W-40 · 20W-50 |
| Engine Oil Capacity | 4.0 qt |
| Engine Oil | 5W-30 · 10W-30 · 10W-40 · 15W-40 · 20W-40 · 20W-50 |
| Engine Oil Capacity | 4.0 qt |
| Engine Oil | 5W-30 · 10W-30 · 10W-40 · 15W-40 · 20W-40 · 20W-50 |
| Engine Oil Capacity | 5.0 qt |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
The provided federal record spans 1990 through 2002, which describes a later generation that peaks dramatically in 1999 with 521 complaints and 9 recalls before trending downward. The 1984 Mercury Cougar predates this dataset entirely, meaning it falls outside the provided generational arc and cannot be compared to adjacent years for trend analysis. For the 1984 model year specifically, the data shows 7 electrical system complaints, 2 engine and cooling complaints, 2 steering complaints, and 2 hydraulic brake complaints, alongside 1 crash complaint and 3 fire complaints. The data does not specify the root causes for these issues. Because the target year lacks comparative context within its own generation, buyers cannot use the provided federal record to assess its relative reliability. Given the presence of three fire complaints and the absence of broader generational data to contextualize them, this is a difficult year to confidently recommend without an independent mechanical inspection.
All 20 complaints on record, top 8 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 1 of 1 campaigns on record for this vehicle.
THE BOLTS THAT ATTACH THE D-SHAPED RING FOR THE SHOULDER BELT ARE INADEQUATELY SUPPORTED BY THE MATERIAL IN WHICH THEY ARE MOUNTED. THE ATTACHMENT DOES NOT COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY… Remedy: DEALERS WILL INSTALL NEW ATTACHING HARDWARE TO IMPROVE THE STRENGTH OF THE MOUNTING.
Showing 5 of 12 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| 01157 | 2001-08-06 | Unknown Or Other | INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC |
| 9888 | 1998-04-27 | Power Train | INFORMATION ON A NEW TRANSMISSION FLUID USAGE CHART. *YC |
| 9874 | 1998-04-13 | Engine And Engine Cooling | A NEW SILICONE GASKET AND SEALANT. *YC |
| 9852 | 1998-04-13 | Tires | INFORMATION ON TIRE COMPANY TELEPHONE NUMBERS FOR CUSTOMER ASSISTANCE. *YC |
| 985A13 | 1998-03-18 | Service Brakes, Hydraulic | THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER… |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
4.0 qt of 30W. MULTI-VISCOSITY: BELOW 100 degrees F 5W-30. ABOVE 0 degrees F 10W-30 OR 10W-40. ABOVE 10 degrees F 15W-40. ABOVE 20 degrees F 20W-40 OR 20W-50, per the factory manual.
NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.