| Engine | US quarts | Litres | US fl oz |
|---|---|---|---|
| GX120 | 0.59 | 0.56 | 19 |
| GX160 | 0.61 | 0.58 | 20 |
| GX200 | 0.63 | 0.6 | 20 |
| GX270 | 1.16 | 1.1 | 37 |
| GX390 | 1.16 | 1.1 | 37 |
Source: Honda Engines official specification pages (engines.honda.com/models/model-detail/mid-gx, engines.honda.com/models/model-detail/large-gx, engines.honda.com/models/model-detail/x-large-gx), checked 2 Nov 2026. Power is SAE J1349 net output measured by Honda; engines installed in equipment may vary. This site is independent and not affiliated with Honda.
Checking the level
- Stand the equipment on level ground with the engine off.
- Remove the filler cap/dipstick and wipe it clean.
- Rest the dipstick in the filler neck without screwing it in, then pull it out and read it.
- Top up to the edge of the filler neck if the level is low. Don’t overfill.
Fluid ounces are rounded from the quart figure (1 US qt = 32 fl oz). Your owner’s manual for the exact engine type is the final word on oil grade and capacity.