1998 Mitsubishi Diamante Oil Type & Capacity: 5W-30 (4.5 quarts)
The 1998 Mitsubishi Diamante takes 5W-30 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| ES | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| LS | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
More factory specs & repair guides for your Diamante
🛞 1998 Mitsubishi Diamante Tire Size & Pressure →🌧️ 1998 Mitsubishi Diamante Wiper Blade Sizes →💡 1998 Mitsubishi Diamante Light Bulb Sizes →📖 1998 Mitsubishi Diamante Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.0 quarts (9.46 L) — 50/50 mixture of Ethylene Glycol Antifreeze and water
Frequently asked questions
What type of oil does a 1998 Mitsubishi Diamante take?
The 1998 Mitsubishi Diamante takes 5W-30 motor oil (API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1998 Mitsubishi Diamante?
The 1998 Mitsubishi Diamante oil capacity is 4.5 quarts with a filter change, or 4.0 quarts without changing the filter.
How often should I change the oil in my 1998 Mitsubishi Diamante?
Most 1998 Mitsubishi Diamante 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 — Mitsubishi recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1998 Mitsubishi Diamante?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1998 Mitsubishi Diamante. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.