The Hummer H2 generally requires 5W-30 engine oil that meets GM specifications (Dexos1 Gen 1 or the older GM 6094M) and API SN or newer. It can be used as a full synthetic or a synthetic-blend. Always check your specific model year in the owner's manual for exact requirements.
The H2 uses a big V8 engine that operates across a wide temperature range, so choosing a compatible oil is key to protecting the engine and maintaining performance. While Dexos1 Gen 1 is the common standard for GM gasoline engines of that era, some references also note GM 6094M as an acceptable alternative depending on production year and regional guidance. API SN or newer is typically required by modern oils.
Oil specifications for the H2
To ensure proper lubrication and warranty coverage, use oil that meets the GM specification and API service category. The most commonly recommended viscosity for the H2’s 6.0-liter V8 is 5W-30, available as either a full synthetic or a synthetic-blend oil, provided it carries the appropriate GM specification.
Recommended options to consider include:
- 5W-30 full synthetic oil that meets Dexos1 Gen 1
- 5W-30 synthetic-blend oil that meets Dexos1 Gen 1
- 5W-30 oil that meets GM 6094M (if Dexos1 is not available in your region)
- In extreme heat or heavy towing, some owners opt for a higher-viscosity 5W-40 oil while still meeting GM specifications
Note: Always verify the exact specification called for in your vehicle’s owner's manual, as GM updated specifications during the H2’s production window.
Viscosity and climate considerations
5W-30 is the standard viscosity for most H2s, offering good cold-start protection and high-temperature performance. If you drive in extremely hot climates or tow heavy loads regularly, consult your manual or a GM service advisor about whether a slightly thicker oil (such as 5W-40) is appropriate for your specific year and usage, while ensuring it still meets the GM specification and API requirements.
Maintenance and oil-change intervals
Oil-change intervals depend on driving conditions and oil type. With conventional oil, intervals are typically around 3,000–5,000 miles (4,800–8,000 km). With synthetic or synthetic-blend oils, intervals can extend to roughly 5,000–7,500 miles (8,000–12,000 km) or as recommended by GM service guidelines. Always follow the owner’s manual and replace the oil filter with every change, checking the level with the dipstick between changes if you drive under severe conditions.
Summary
For the H2’s 6.0-liter V8, use 5W-30 engine oil that meets GM specifications (Dexos1 Gen 1 or GM 6094M) and API SN or newer, with options for full synthetic or synthetic-blend. Confirm the exact specification for your year in the owner’s manual, and adjust viscosity based on climate and towing needs. Regular oil changes with the correct spec help maintain engine performance and longevity.