1991 Chevrolet Blazer Oil Type & Capacity
The 1991 Chevrolet Blazer oil type depends on the engine: the 5.7 K, Automatic, 4L60/MD8 takes 10W-30 (5.0 quarts with filter); the 5.7 K, Automatic, 700R4/MD8 takes 10W-30 (5.0 quarts with filter); the 5.7 K, Standard takes 10W-30 (5.0 quarts with filter); the 6.2 C, 4L60/MD8 takes 10W-30 (7.0 quarts with filter); the 6.2 C, 700R4/MD8 takes 10W-30 (7.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 5.7 K, Automatic, 4L60/MD8: 10W-30, 5.0 quarts with filter
- 5.7 K, Automatic, 700R4/MD8: 10W-30, 5.0 quarts with filter
- 5.7 K, Standard: 10W-30, 5.0 quarts with filter
- 6.2 C, 4L60/MD8: 10W-30, 7.0 quarts with filter
- 6.2 C, 700R4/MD8: 10W-30, 7.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 5.7 K, Automatic, 4L60/MD8 — Eng VIN K | SAE 10W-30 Energy Conserving Engine | 5.00 QTS. | 4.00 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| 5.7 K, Automatic, 700R4/MD8 — Eng VIN K | SAE 10W-30 Energy Conserving Engine | 5.00 QTS. | 4.00 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| 5.7 K, Standard — Eng VIN K | SAE 10W-30 Energy Conserving Engine | 5.00 QTS. | 4.00 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| 6.2 C, 4L60/MD8 — Eng VIN C | SAE 10W-30 or 15W-40 | 7.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| 6.2 C, 700R4/MD8 — Eng VIN C | SAE 10W-30 or 15W-40 | 7.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
Buy the right oil
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More specs & repair guides for your Blazer
1991 Chevrolet Blazer factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
18.5 quarts (17.5 L) — 56/44 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1991 Chevrolet Blazer take?
It depends on the engine: 5.7 K, Automatic, 4L60/MD8 uses 10W-30; 5.7 K, Automatic, 700R4/MD8 uses 10W-30; 5.7 K, Standard uses 10W-30; 6.2 C, 4L60/MD8 uses 10W-30; 6.2 C, 700R4/MD8 uses 10W-30.
How much oil does a 1991 Chevrolet Blazer take?
Capacity depends on the engine: 5.7 K, Automatic, 4L60/MD8 holds 5.0 quarts with filter; 5.7 K, Automatic, 700R4/MD8 holds 5.0 quarts with filter; 5.7 K, Standard holds 5.0 quarts with filter; 6.2 C, 4L60/MD8 holds 7.0 quarts with filter; 6.2 C, 700R4/MD8 holds 7.0 quarts with filter.
Can I use synthetic oil in my 1991 Chevrolet Blazer?
Yes. 10W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Chevrolet Blazer. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.