1991 Pontiac Trans Sport Oil Type & Capacity: 5W-30 (4.5 quarts)
The 1991 Pontiac Trans Sport 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 |
|---|---|---|---|---|
| Base, 125C/MD9 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 3T40/MD9 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| SE, 125C/MD9 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| SE, 3T40/MD9 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
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More factory specs & repair guides for your Trans Sport
🛞 1991 Pontiac Trans Sport Tire Size & Pressure →🌧️ 1991 Pontiac Trans Sport Wiper Blade Sizes →💡 1991 Pontiac Trans Sport Light Bulb Sizes →📖 1991 Pontiac Trans Sport Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
15.0 quarts (14.19 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1991 Pontiac Trans Sport take?
The 1991 Pontiac Trans Sport takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
What is the oil capacity of a 1991 Pontiac Trans Sport?
The 1991 Pontiac Trans Sport 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 1991 Pontiac Trans Sport?
Most 1991 Pontiac Trans Sport 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 — Pontiac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Pontiac Trans Sport?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Pontiac Trans Sport. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.