1990 Infiniti Q45 Oil Type & Capacity
The 1990 Infiniti Q45 takes 5W-30 motor oil — 6.4 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 6.4 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Q45 — 4.5L Eng | API - SAE 5W-30 (Below 50Deg.F), 10W-30/40 (Above 0Deg.F) | 6.40 QTS. | 5.80 QTS. | — |
Buy the right oil
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More specs & repair guides for your Q45
1990 Infiniti Q45 factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
10.8 quarts (10.22 L) — Ethylene Glycol Antifreeze Coolant
Frequently asked questions
What type of oil does a 1990 Infiniti Q45 take?
The 1990 Infiniti Q45 takes 5W-30 motor oil (API - SAE 5W-30 (Below 50Deg.F), 10W-30/40 (Above 0Deg.F)), per the factory service manual.
How much oil does a 1990 Infiniti Q45 take?
The 1990 Infiniti Q45 holds 6.4 quarts with a filter change, or 5.8 quarts without changing the filter.
Can I use synthetic oil in my 1990 Infiniti Q45?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Infiniti Q45. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.