1985 Buick Riviera Oil Type & Capacity
The 1985 Buick Riviera oil type depends on the engine: the Base, 2D Convertible, 3.8 9 takes 5W-30 (5.0 quarts qt with filter); the Base, 2D Convertible, 5.0 Y takes 5W-30 (4.0 quarts qt with filter); the Base, 2D Coupe, 5.0 Y takes 5W-30 (4.0 quarts qt with filter); the Base, 2D Coupe, 5.7 N takes 5W-30 (6.5 quarts qt with filter); the T-Type takes 5W-30 (5.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base, 2D Convertible, 3.8 9: 5W-30, 5.0 quarts with filter
- Base, 2D Convertible, 5.0 Y: 5W-30, 4.0 quarts with filter
- Base, 2D Coupe, 5.0 Y: 5W-30, 4.0 quarts with filter
- Base, 2D Coupe, 5.7 N: 5W-30, 6.5 quarts with filter
- T-Type: 5W-30, 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 2D Convertible, 3.8 9 — 3.8L Eng | SAE 5W-30 (60Deg.F to Below -20Deg.F) 10W-30 (Preferred) or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above100Deg.F), 20W-20, 20W-40 or 20W-50 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| Base, 2D Convertible, 5.0 Y — 5.0L Eng | SAE 5W-30 (60Deg.F to Below -20Deg.F) 10W-30 (Preferred) or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above100Deg.F), 20W-20, 20W-40 or 20W-50 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Base, 2D Coupe, 5.0 Y — 5.0L Eng | SAE 5W-30 (60Deg.F to Below -20Deg.F) 10W-30 (Preferred) or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above100Deg.F), 20W-20, 20W-40 or 20W-50 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Base, 2D Coupe, 5.7 N — 5.7L Eng | SAE 5W-30 (60Deg.F to Below -20Deg.F) 10W-30 (Preferred) or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above100Deg.F), 20W-20, 20W-40 or 20W-50 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 6.50 QTS. | — | — |
| T-Type — 3.8L Eng | SAE 5W-30 (60Deg.F to Below -20Deg.F) 10W-30 (Preferred) or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above100Deg.F), 20W-20, 20W-40 or 20W-50 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
More factory specs & repair guides for your Riviera
🛞 1985 Buick Riviera Tire Size & Pressure →🌧️ 1985 Buick Riviera Wiper Blade Sizes →💡 1985 Buick Riviera Light Bulb Sizes →📖 1985 Buick Riviera Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
13.0 quarts (12.3 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1985 Buick Riviera take?
It depends on the engine: Base, 2D Convertible, 3.8 9 uses 5W-30; Base, 2D Convertible, 5.0 Y uses 5W-30; Base, 2D Coupe, 5.0 Y uses 5W-30; Base, 2D Coupe, 5.7 N uses 5W-30; T-Type uses 5W-30.
What is the oil capacity of a 1985 Buick Riviera?
Oil capacity depends on the engine: Base, 2D Convertible, 3.8 9 holds 5.0 quarts with filter; Base, 2D Convertible, 5.0 Y holds 4.0 quarts with filter; Base, 2D Coupe, 5.0 Y holds 4.0 quarts with filter; Base, 2D Coupe, 5.7 N holds 6.5 quarts with filter; T-Type holds 5.0 quarts with filter.
How often should I change the oil in my 1985 Buick Riviera?
Most 1985 Buick Riviera owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — Buick recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1985 Buick Riviera?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1985 Buick Riviera. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.