1999 GMC Suburban Oil Type & Capacity
The 1999 GMC Suburban oil type depends on the engine: the C1500, 5.7 R takes 5W-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 5W-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 5W-30 (7.0 quarts qt with filter); the K1500, 5.7 R takes 5W-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 5W-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 5W-30 (7.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- C1500, 5.7 R: 5W-30, 5.0 quarts with filter
- C1500, 6.5 F: 15W-40, 8.0 quarts with filter
- C2500, 5.7 R: 5W-30, 5.0 quarts with filter
- C2500, 6.5 F: 15W-40, 8.0 quarts with filter
- C2500, 7.4 J: 5W-30, 7.0 quarts with filter
- K1500, 5.7 R: 5W-30, 5.0 quarts with filter
- K1500, 6.5 F: 15W-40, 8.0 quarts with filter
- K2500, 5.7 R: 5W-30, 5.0 quarts with filter
- K2500, 6.5 F: 15W-40, 8.0 quarts with filter
- K2500, 7.4 J: 5W-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 5W-30 | 5.00 QTS. | — | — |
| C1500, 6.5 F — 6.5L Eng | API - SAE 15W-40 | 8.00 QTS. | — | — |
| C2500, 5.7 R — 5.7L Eng | API - SAE 5W-30 | 5.00 QTS. | — | — |
| C2500, 6.5 F — 6.5L Eng | API - SAE 15W-40 | 8.00 QTS. | — | — |
| C2500, 7.4 J — 7.4L Eng | API - SAE 5W-30 | 7.00 QTS. | — | — |
| K1500, 5.7 R — 5.7L Eng | API - SAE 5W-30 | 5.00 QTS. | — | — |
| K1500, 6.5 F — 6.5L Eng | API - SAE 15W-40 | 8.00 QTS. | — | — |
| K2500, 5.7 R — 5.7L Eng | API - SAE 5W-30 | 5.00 QTS. | — | — |
| K2500, 6.5 F — 6.5L Eng | API - SAE 15W-40 | 8.00 QTS. | — | — |
| K2500, 7.4 J — 7.4L Eng | API - SAE 5W-30 | 7.00 QTS. | — | — |
More factory specs & repair guides for your Suburban
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Coolant capacity
20.0 quarts (18.92 L) — 50/50 mixture of DEX-COOL and clean, drinkable water
Frequently asked questions
What type of oil does a 1999 GMC Suburban take?
It depends on the engine: C1500, 5.7 R uses 5W-30; C1500, 6.5 F uses 15W-40; C2500, 5.7 R uses 5W-30; C2500, 6.5 F uses 15W-40; C2500, 7.4 J uses 5W-30; K1500, 5.7 R uses 5W-30; K1500, 6.5 F uses 15W-40; K2500, 5.7 R uses 5W-30; K2500, 6.5 F uses 15W-40; K2500, 7.4 J uses 5W-30.
What is the oil capacity of a 1999 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 1999 GMC Suburban?
Most 1999 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 1999 GMC Suburban?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1999 GMC Suburban. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.