1998 Infiniti Q45 Oil Type & Capacity: 5W-30 (5.6 quarts)
The 1998 Infiniti Q45 takes 5W-30 motor oil — 5.6 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.6 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base — 4.1L Eng | API - SAE 5W-30 (Preferred) (Below 0Deg.F to above 100Deg.F), 10W-30 (Above 0Deg.F) | 5.60 QTS. | 5.10 QTS. | — |
| t — 4.1L Eng | API - SAE 5W-30 (Preferred) (Below 0Deg.F to above 100Deg.F), 10W-30 (Above 0Deg.F) | 5.60 QTS. | 5.10 QTS. | — |
Complete Oil Change Bundle for 1998 Infiniti Q45
Everything you need delivered in one order. Pre-matched to your factory spec (5W-30, 5.6 quarts).
As an Amazon Associate we earn from qualifying purchases. Prices shown are real-time retail estimates.
Buy the right oil & filter for your Q45
🛒 Buy 5W-30 Full Synthetic Oil (5.6 quarts needed) on Amazon💡 Capacity Note: Your 1998 Infiniti Q45 holds 5.6 quarts with filter. Since standard jugs are 5 quarts, be sure to pick up extra 1-quart bottles or a 2-pack to reach the full mark on the dipstick.
Popular Full Synthetic Brands (5W-30):
As an Amazon Associate we earn from qualifying purchases made through these links.
More factory specs & repair guides for your Q45
🛞 1998 Infiniti Q45 Tire Size & Pressure →🌧️ 1998 Infiniti Q45 Wiper Blade Sizes →💡 1998 Infiniti Q45 Light Bulb Sizes →📖 1998 Infiniti Q45 Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
12.4 quarts (11.73 L) — Ethylene Glycol Antifreeze Coolant
Frequently asked questions
What type of oil does a 1998 Infiniti Q45 take?
The 1998 Infiniti Q45 takes 5W-30 motor oil (API - SAE 5W-30 (Preferred) (Below 0Deg.F to above 100Deg.F), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1998 Infiniti Q45?
The 1998 Infiniti Q45 oil capacity is 5.6 quarts with a filter change, or 5.1 quarts without changing the filter.
How often should I change the oil in my 1998 Infiniti Q45?
Most 1998 Infiniti Q45 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 — Infiniti recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1998 Infiniti Q45?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1998 Infiniti Q45. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.