1989 Cadillac Fleetwood Oil Type & Capacity: 5W-30 (5.5 quarts)
The 1989 Cadillac Fleetwood takes 5W-30 motor oil — 5.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 2D Coupe — 4.5L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | — | 5.00 QTS. | — |
| Base, 4D Sedan — 4.5L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | — | 5.00 QTS. | — |
| Sixty Special — 4.5L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | — | 5.00 QTS. | — |
Complete Oil Change Bundle for 1989 Cadillac Fleetwood
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Buy the right oil & filter for your Fleetwood
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More factory specs & repair guides for your Fleetwood
🛞 1989 Cadillac Fleetwood Tire Size & Pressure →🌧️ 1989 Cadillac Fleetwood Wiper Blade Sizes →💡 1989 Cadillac Fleetwood Light Bulb Sizes →📖 1989 Cadillac Fleetwood Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.6 quarts (10.03 L) — 50/50 mixture of Ethylene Glycol Base Coolant and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1989 Cadillac Fleetwood take?
The 1989 Cadillac Fleetwood takes 5W-30 motor oil (SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F)), per the factory service manual.
What is the oil capacity of a 1989 Cadillac Fleetwood?
The 1989 Cadillac Fleetwood oil capacity is 5.5 quarts with a filter change, or 5.0 quarts without changing the filter.
How often should I change the oil in my 1989 Cadillac Fleetwood?
Most 1989 Cadillac Fleetwood 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 — Cadillac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1989 Cadillac Fleetwood?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1989 Cadillac Fleetwood. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.