1984 Plymouth Conquest Oil Type & Capacity
The 1984 Plymouth Conquest takes 5W-20 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-20 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Automatic | API - SAE 5W-20/30/40 (Below 60Deg.F), 10W-30/40/50 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 20W-20 (20Deg.F to 80Deg. F), 20W-40/50/30 (Above 20Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| Standard | API - SAE 5W-20/30/40 (Below 60Deg.F), 10W-30/40/50 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 20W-20 (20Deg.F to 80Deg. F), 20W-40/50/30 (Above 20Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
Buy the right oil
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More specs & repair guides for your Conquest
1984 Plymouth Conquest factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
9.5 quarts (8.99 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water
Frequently asked questions
What type of oil does a 1984 Plymouth Conquest take?
The 1984 Plymouth Conquest takes 5W-20 motor oil (API - SAE 5W-20/30/40 (Below 60Deg.F), 10W-30/40/50 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 20W-20 (20Deg.F to 80Deg. F), 20W-40/50/30 (Above 20Deg.F)), per the factory service manual.
How much oil does a 1984 Plymouth Conquest take?
The 1984 Plymouth Conquest holds 4.5 quarts with a filter change, or 4.0 quarts without changing the filter.
Can I use synthetic oil in my 1984 Plymouth Conquest?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 Plymouth Conquest. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.