1998 GMC Suburban Oil Type & Capacity
The 1998 GMC Suburban oil type depends on the engine: the C1500, 5.7 R takes 10W-30 (5.0 quarts qt with filter); the C1500, 6.5 F takes 15W-40 (8.0 quarts qt with filter); the C2500, 5.7 R takes 10W-30 (5.0 quarts qt with filter); the C2500, 6.5 F takes 15W-40 (8.0 quarts qt with filter); the C2500, 7.4 J takes 10W-30 (7.0 quarts qt with filter); the K1500, 5.7 R takes 10W-30 (5.0 quarts qt with filter); the K1500, 6.5 F takes 15W-40 (8.0 quarts qt with filter); the K2500, 5.7 R takes 10W-30 (5.0 quarts qt with filter); the K2500, 6.5 F takes 15W-40 (8.0 quarts qt with filter); the K2500, 7.4 J takes 10W-30 (7.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- C1500, 5.7 R: 10W-30, 5.0 quarts with filter
- C1500, 6.5 F: 15W-40, 8.0 quarts with filter
- C2500, 5.7 R: 10W-30, 5.0 quarts with filter
- C2500, 6.5 F: 15W-40, 8.0 quarts with filter
- C2500, 7.4 J: 10W-30, 7.0 quarts with filter
- K1500, 5.7 R: 10W-30, 5.0 quarts with filter
- K1500, 6.5 F: 15W-40, 8.0 quarts with filter
- K2500, 5.7 R: 10W-30, 5.0 quarts with filter
- K2500, 6.5 F: 15W-40, 8.0 quarts with filter
- K2500, 7.4 J: 10W-30, 7.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| C1500, 5.7 R — 5.7L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| C1500, 6.5 F — 6.5L Eng | API - SAE 15W-40 (Above 0Deg.F) (Preferred), 10W-30 (Below 0Deg.F), 30 (Above 32Deg.F) | 8.00 QTS. | 7.00 QTS. | — |
| C2500, 5.7 R — 5.7L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| C2500, 6.5 F — 6.5L Eng | API - SAE 15W-40 (Above 0Deg.F) (Preferred), 10W-30 (Below 0Deg.F), 30 (Above 32Deg.F) | 8.00 QTS. | 7.00 QTS. | — |
| C2500, 7.4 J — 7.4L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 7.00 QTS. | 6.00 QTS. | — |
| K1500, 5.7 R — 5.7L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| K1500, 6.5 F — 6.5L Eng | API - SAE 15W-40 (Above 0Deg.F) (Preferred), 10W-30 (Below 0Deg.F), 30 (Above 32Deg.F) | 8.00 QTS. | 7.00 QTS. | — |
| K2500, 5.7 R — 5.7L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| K2500, 6.5 F — 6.5L Eng | API - SAE 15W-40 (Above 0Deg.F) (Preferred), 10W-30 (Below 0Deg.F), 30 (Above 32Deg.F) | 8.00 QTS. | 7.00 QTS. | — |
| K2500, 7.4 J — 7.4L Eng | API - SAE 10W-30 (Above 0Deg.F), 5W-30 (Below 0Deg.F) | 7.00 QTS. | 6.00 QTS. | — |
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More factory specs & repair guides for your Suburban
🛞 1998 GMC Suburban Tire Size & Pressure →🌧️ 1998 GMC Suburban Wiper Blade Sizes →💡 1998 GMC Suburban Light Bulb Sizes →📖 1998 GMC Suburban Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
20.0 quarts (18.92 L) — 50/50 mixture of DEX-COOL and clean water (preferably distilled)
Frequently asked questions
What type of oil does a 1998 GMC Suburban take?
It depends on the engine: C1500, 5.7 R uses 10W-30; C1500, 6.5 F uses 15W-40; C2500, 5.7 R uses 10W-30; C2500, 6.5 F uses 15W-40; C2500, 7.4 J uses 10W-30; K1500, 5.7 R uses 10W-30; K1500, 6.5 F uses 15W-40; K2500, 5.7 R uses 10W-30; K2500, 6.5 F uses 15W-40; K2500, 7.4 J uses 10W-30.
What is the oil capacity of a 1998 GMC Suburban?
Oil capacity depends on the engine: C1500, 5.7 R holds 5.0 quarts with filter; C1500, 6.5 F holds 8.0 quarts with filter; C2500, 5.7 R holds 5.0 quarts with filter; C2500, 6.5 F holds 8.0 quarts with filter; C2500, 7.4 J holds 7.0 quarts with filter; K1500, 5.7 R holds 5.0 quarts with filter; K1500, 6.5 F holds 8.0 quarts with filter; K2500, 5.7 R holds 5.0 quarts with filter; K2500, 6.5 F holds 8.0 quarts with filter; K2500, 7.4 J holds 7.0 quarts with filter.
How often should I change the oil in my 1998 GMC Suburban?
Most 1998 GMC Suburban 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 1998 GMC Suburban?
Yes. 10W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1998 GMC Suburban. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.