1985 Oldsmobile Custom Cruiser Oil Type & Capacity
The 1985 Oldsmobile Custom Cruiser oil type depends on the engine: the 5.0 Y takes 5W-30 (4.0 quarts with filter); the 5.7 N takes 10W-30 (7.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 5.0 Y: 5W-30, 4.0 quarts with filter
- 5.7 N: 10W-30, 7.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 5.0 Y — 5.0L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 & 10W-40 (0Deg.F to over 100Deg.F), 15W-40 (15Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| 5.7 N — 5.7L Eng | SAE 10W-30 (Below -20Deg.F to 60Deg.F), 15W-40 (15Deg.F to 60Deg.F), 30 (Preferred) (32Deg.F to over 100Deg.F) | 7.00 QTS. | — | — |
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More specs & repair guides for your Custom Cruiser
1985 Oldsmobile Custom Cruiser factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
15.5 quarts (14.66 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1985 Oldsmobile Custom Cruiser take?
It depends on the engine: 5.0 Y uses 5W-30; 5.7 N uses 10W-30.
How much oil does a 1985 Oldsmobile Custom Cruiser take?
Capacity depends on the engine: 5.0 Y holds 4.0 quarts with filter; 5.7 N holds 7.0 quarts with filter.
Can I use synthetic oil in my 1985 Oldsmobile Custom Cruiser?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1985 Oldsmobile Custom Cruiser. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.