1989 Dodge Diplomat Oil Type & Capacity: 5W-30 (5.0 quarts)
The 1989 Dodge Diplomat takes 5W-30 motor oil — 5.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Salon, 5.2 4 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| Salon, 5.2 P | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| Salon, 5.2 S | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| SE, 5.2 4 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| SE, 5.2 P | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| SE, 5.2 S | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
More factory specs & repair guides for your Diplomat
🛞 1989 Dodge Diplomat Tire Size & Pressure →🌧️ 1989 Dodge Diplomat Wiper Blade Sizes →💡 1989 Dodge Diplomat Light Bulb Sizes →📖 1989 Dodge Diplomat Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
16.5 quarts (15.61 L) — 50/50 mixture of water and Ethylene-Glycol Base Antifreeze, such as MOPAR, PRESTON II, PEAK, or antifreeze containing the Alugard 340-2 inhibitor system.
Frequently asked questions
What type of oil does a 1989 Dodge Diplomat take?
The 1989 Dodge Diplomat takes 5W-30 motor oil (API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F), 15W-40 (Above 10Deg. F), 30 (Above 20Deg.F)), per the factory service manual.
What is the oil capacity of a 1989 Dodge Diplomat?
The 1989 Dodge Diplomat oil capacity is 5.0 quarts with a filter change, or 4.0 quarts without changing the filter.
How often should I change the oil in my 1989 Dodge Diplomat?
Most 1989 Dodge Diplomat 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 — Dodge recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1989 Dodge Diplomat?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1989 Dodge Diplomat. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.