1990 GMC Magnavan Oil Type & Capacity
The 1990 GMC Magnavan oil type depends on the engine: the 5.7 K, 3L80-HD/M40 takes 5W-30 (5.0 quarts qt with filter); the 5.7 K, 3L80/M40 takes 5W-30 (5.0 quarts qt with filter); the 5.7 K, 400/M40 takes 5W-30 (5.0 quarts qt with filter); the 5.7 K, 475/M40 takes 5W-30 (5.0 quarts qt with filter); the 6.2 J, 3L80-HD/M40 takes 5W-30 (7.0 quarts qt with filter); the 6.2 J, 3L80/M40 takes 5W-30 (7.0 quarts qt with filter); the 6.2 J, 400/M40 takes 5W-30 (7.0 quarts qt with filter); the 6.2 J, 475/M40 takes 5W-30 (7.0 quarts qt with filter); the 7.4 N, 3L80-HD/M40 takes 5W-30 (6.0 quarts qt with filter); the 7.4 N, 3L80/M40 takes 5W-30 (6.0 quarts qt with filter); the 7.4 N, 400/M40 takes 5W-30 (6.0 quarts qt with filter); the 7.4 N, 475/M40 takes 5W-30 (6.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 5.7 K, 3L80-HD/M40: 5W-30, 5.0 quarts with filter
- 5.7 K, 3L80/M40: 5W-30, 5.0 quarts with filter
- 5.7 K, 400/M40: 5W-30, 5.0 quarts with filter
- 5.7 K, 475/M40: 5W-30, 5.0 quarts with filter
- 6.2 J, 3L80-HD/M40: 5W-30, 7.0 quarts with filter
- 6.2 J, 3L80/M40: 5W-30, 7.0 quarts with filter
- 6.2 J, 400/M40: 5W-30, 7.0 quarts with filter
- 6.2 J, 475/M40: 5W-30, 7.0 quarts with filter
- 7.4 N, 3L80-HD/M40: 5W-30, 6.0 quarts with filter
- 7.4 N, 3L80/M40: 5W-30, 6.0 quarts with filter
- 7.4 N, 400/M40: 5W-30, 6.0 quarts with filter
- 7.4 N, 475/M40: 5W-30, 6.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 5.7 K, 3L80-HD/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 5.7 K, 3L80/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 5.7 K, 400/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 5.7 K, 475/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 6.2 J, 3L80-HD/M40 — G3500,6.2L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 6.2 J, 3L80/M40 — G3500,6.2L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 6.2 J, 400/M40 — G3500,6.2L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 6.2 J, 475/M40 — G3500,6.2L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 7.4 N, 3L80-HD/M40 — G3500,7.4L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 6.00 QTS. | 5.00 QTS. | — |
| 7.4 N, 3L80-HD/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 7.4 N, 3L80/M40 — G3500,7.4L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 6.00 QTS. | 5.00 QTS. | — |
| 7.4 N, 3L80/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 7.4 N, 400/M40 — G3500,7.4L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 6.00 QTS. | 5.00 QTS. | — |
| 7.4 N, 400/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| 7.4 N, 475/M40 — G3500,7.4L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 6.00 QTS. | 5.00 QTS. | — |
| 7.4 N, 475/M40 — Gas | API - SAE 5W-30 (Below -20Deg.F to Above 100Deg.F), 10W-30 (Above 0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
More factory specs & repair guides for your Magnavan
🛞 1990 GMC Magnavan Tire Size & Pressure →🌧️ 1990 GMC Magnavan Wiper Blade Sizes →💡 1990 GMC Magnavan Light Bulb Sizes →📖 1990 GMC Magnavan Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
17.0 quarts (16.08 L) — 56/44 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1990 GMC Magnavan take?
It depends on the engine: 5.7 K, 3L80-HD/M40 uses 5W-30; 5.7 K, 3L80/M40 uses 5W-30; 5.7 K, 400/M40 uses 5W-30; 5.7 K, 475/M40 uses 5W-30; 6.2 J, 3L80-HD/M40 uses 5W-30; 6.2 J, 3L80/M40 uses 5W-30; 6.2 J, 400/M40 uses 5W-30; 6.2 J, 475/M40 uses 5W-30; 7.4 N, 3L80-HD/M40 uses 5W-30; 7.4 N, 3L80/M40 uses 5W-30; 7.4 N, 400/M40 uses 5W-30; 7.4 N, 475/M40 uses 5W-30.
What is the oil capacity of a 1990 GMC Magnavan?
Oil capacity depends on the engine: 5.7 K, 3L80-HD/M40 holds 5.0 quarts with filter; 5.7 K, 3L80/M40 holds 5.0 quarts with filter; 5.7 K, 400/M40 holds 5.0 quarts with filter; 5.7 K, 475/M40 holds 5.0 quarts with filter; 6.2 J, 3L80-HD/M40 holds 7.0 quarts with filter; 6.2 J, 3L80/M40 holds 7.0 quarts with filter; 6.2 J, 400/M40 holds 7.0 quarts with filter; 6.2 J, 475/M40 holds 7.0 quarts with filter; 7.4 N, 3L80-HD/M40 holds 6.0 quarts with filter; 7.4 N, 3L80/M40 holds 6.0 quarts with filter; 7.4 N, 400/M40 holds 6.0 quarts with filter; 7.4 N, 475/M40 holds 6.0 quarts with filter.
How often should I change the oil in my 1990 GMC Magnavan?
Most 1990 GMC Magnavan 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 — GMC recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1990 GMC Magnavan?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 GMC Magnavan. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.