1991 Pontiac Trans Sport Oil Type & Capacity
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. | — |
Buy the right oil
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More specs & repair guides for your Trans Sport
1991 Pontiac Trans Sport factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site 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.
How much oil does a 1991 Pontiac Trans Sport take?
The 1991 Pontiac Trans Sport holds 4.5 quarts with a filter change, or 4.0 quarts without changing the filter.
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.