1998 GMC Envoy Oil Type & Capacity: 5W-30 (4.5 quarts)
The 1998 GMC Envoy takes 5W-30 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Envoy | API - SAE 5W-30 | 4.50 QTS. | — | — |
More factory specs & repair guides for your Envoy
🛞 1998 GMC Envoy Tire Size & Pressure →🌧️ 1998 GMC Envoy Wiper Blade Sizes →💡 1998 GMC Envoy Light Bulb Sizes →📖 1998 GMC Envoy Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.7 quarts (11.07 L) — 50/50 mixture of DEX-COOL and clean water (preferably distilled)
Frequently asked questions
What type of oil does a 1998 GMC Envoy take?
The 1998 GMC Envoy takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
What is the oil capacity of a 1998 GMC Envoy?
The 1998 GMC Envoy oil capacity is 4.5 quarts with a filter change.
How often should I change the oil in my 1998 GMC Envoy?
Most 1998 GMC Envoy 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 Envoy?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1998 GMC Envoy. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.