⚙️Transmission Fluid
Hummer H3 Transmission Fluid
Find the correct transmission fluid type and capacity for your Hummer H3. Covers automatic and manual transmissions for all years.
Quick Answer
The Hummer H3 transmission fluid type depends on your transmission — automatic models typically use ATF WS, Dexron, or manufacturer-specific fluid. Manual transmissions use gear oil. See the year breakdown below.
2006-2010
2006-2010Automatic Fluid TypeDexron III/VI or manufacturer-specific ATF
Auto Drain & Fill3.0 - 4.0 quarts
Auto Total Capacity7.0 - 12.0 quarts
Manual Fluid Type75W-90 gear oil
Manual Capacity2.0 - 3.0 quarts
Change Interval30,000 - 60,000 miles
Notes
- →Use ONLY the manufacturer-specified fluid — wrong ATF can damage the transmission
- →Check transmission fluid level with engine running and at operating temperature
- →Dark, burnt-smelling fluid indicates overheating — change immediately
Frequently Asked Questions
- What transmission fluid does a Hummer H3 use?
- The Hummer H3 transmission fluid type depends on the year and transmission. Automatic transmissions use ATF WS, Dexron VI, or manufacturer-specific fluid. Manual transmissions use 75W-90 gear oil. See below for your specific year.
- How much transmission fluid does a Hummer H3 take?
- A drain-and-fill on the Hummer H3 automatic transmission typically takes 3.5-4.0 quarts. The total system capacity is 7-12 quarts. For a complete fluid exchange, you'll need the full capacity amount.
- How often should I change transmission fluid in my Hummer H3?
- Change your Hummer H3 automatic transmission fluid every 60,000-100,000 miles under normal conditions. For severe duty (towing, mountain driving, hot climates), change every 30,000-60,000 miles.
- Does the Hummer H3 have a transmission dipstick?
- Many 2010+ Hummer H3 models have sealed transmissions with no dipstick. Fluid level is checked via a fill plug underneath the vehicle. Older models typically have a traditional dipstick under the hood.