1988 Dodge Diplomat Oil Type & Capacity
The 1988 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 |
|---|---|---|---|---|
| Base | 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 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 | 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. | — |
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More specs & repair guides for your Diplomat
1988 Dodge Diplomat factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site 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 1988 Dodge Diplomat take?
The 1988 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.
How much oil does a 1988 Dodge Diplomat take?
The 1988 Dodge Diplomat holds 5.0 quarts with a filter change, or 4.0 quarts without changing the filter.
Can I use synthetic oil in my 1988 Dodge Diplomat?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1988 Dodge Diplomat. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.