1984 GMC Rally Camper Special Oil Type & Capacity
The 1984 GMC Rally Camper Special oil type depends on the engine: the 5.7 L, 400/M40 takes 5W-30 (5.0 quarts qt with filter); the 5.7 L, 475/M40 takes 5W-30 (5.0 quarts qt with filter); the 6.2 J, 400/M40 takes 10W-30 (7.0 quarts qt with filter); the 6.2 J, 475/M40 takes 10W-30 (7.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 5.7 L, 400/M40: 5W-30, 5.0 quarts with filter
- 5.7 L, 475/M40: 5W-30, 5.0 quarts with filter
- 6.2 J, 400/M40: 10W-30, 7.0 quarts with filter
- 6.2 J, 475/M40: 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 L, 400/M40 — G3500,5.7L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | — | 4.00 QTS. | — |
| 5.7 L, 400/M40 — G3500 | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | 5.00 QTS. | — | — |
| 5.7 L, 475/M40 — G3500,5.7L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | — | 4.00 QTS. | — |
| 5.7 L, 475/M40 — G3500 | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | 5.00 QTS. | — | — |
| 6.2 J, 400/M40 — G3500,6.2L Eng | SAE 10W-30 (Below 0Deg.F to 60Deg.F), 15W-40 (0Deg.F to Above 100Deg.F), SAE 30 (Above 32Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 6.2 J, 400/M40 — G3500 | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | 5.00 QTS. | — | — |
| 6.2 J, 475/M40 — G3500,6.2L Eng | SAE 10W-30 (Below 0Deg.F to 60Deg.F), 15W-40 (0Deg.F to Above 100Deg.F), SAE 30 (Above 32Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| 6.2 J, 475/M40 — G3500 | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 (Above 0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20 (20Deg.F to over 100Deg.F), SAE 30 (40Deg.F to over 100Deg.F) | 5.00 QTS. | — | — |
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More factory specs & repair guides for your Rally Camper Special
🛞 1984 GMC Rally Camper Special Tire Size & Pressure →🌧️ 1984 GMC Rally Camper Special Wiper Blade Sizes →💡 1984 GMC Rally Camper Special Light Bulb Sizes →📖 1984 GMC Rally Camper Special Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
17.5 quarts (16.56 L) — 56/44 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1984 GMC Rally Camper Special take?
It depends on the engine: 5.7 L, 400/M40 uses 5W-30; 5.7 L, 475/M40 uses 5W-30; 6.2 J, 400/M40 uses 10W-30; 6.2 J, 475/M40 uses 10W-30.
What is the oil capacity of a 1984 GMC Rally Camper Special?
Oil capacity depends on the engine: 5.7 L, 400/M40 holds 5.0 quarts with filter; 5.7 L, 475/M40 holds 5.0 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.
How often should I change the oil in my 1984 GMC Rally Camper Special?
Most 1984 GMC Rally Camper Special 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 1984 GMC Rally Camper Special?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 GMC Rally Camper Special. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.