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 qt with filter); the 5.7 K, Automatic, 700R4/MD8 takes 10W-30 (5.0 quarts qt with filter); the 5.7 K, Standard takes 10W-30 (5.0 quarts qt with filter); the 6.2 C, 4L60/MD8 takes 10W-30 (7.0 quarts qt with filter); the 6.2 C, 700R4/MD8 takes 10W-30 (7.0 quarts qt 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. |
More factory specs & repair guides for your Blazer
🛞 1991 Chevrolet Blazer Tire Size & Pressure →🌧️ 1991 Chevrolet Blazer Wiper Blade Sizes →💡 1991 Chevrolet Blazer Light Bulb Sizes →📖 1991 Chevrolet Blazer Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network 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.
What is the oil capacity of a 1991 Chevrolet Blazer?
Oil 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.
How often should I change the oil in my 1991 Chevrolet Blazer?
Most 1991 Chevrolet Blazer 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 — Chevrolet recommends intervals based on driving conditions, not just mileage.
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.