The engine oil capacity for a 2020 Honda Rancher 420 is 1.6 quarts (1.5 liters) when you replace the oil filter, and about 1.4 quarts (1.3 liters) if you do not replace the filter.
Maintenance guides for the 2020 Rancher 420 (TRX420) show two capacity figures depending on whether the filter is changed during the service. These numbers are widely cited for the Rancher 420 line across 2WD and 4WD trims, but owners should consult their specific manual or service bulletin for any regional variations.
Engine oil capacity details
Honda’s official figures distinguish between replacing the oil filter and not replacing it. The capacities below reflect that distinction for the TRX420-based Rancher 420.
- Engine oil capacity with filter: 1.6 quarts (1.5 liters).
- Engine oil capacity without filter: 1.4 quarts (1.3 liters).
When performing an oil change, verify the level after filling and use the dipstick or level indicators to ensure the oil is at the correct mark. Avoid underfilling or overfilling, which can impact engine performance and longevity.
Variants and trim considerations
For the 2020 Rancher 420, the engine oil capacity is generally the same across common trims, including 2WD and 4WD configurations. However, regional editions or specific VIN-based variants can have small differences, so always check the exact specification in your owner’s manual or service bulletin.
Summary
In short, a 2020 Honda Rancher 420 takes about 1.6 quarts (1.5 liters) of engine oil when replacing the filter, or about 1.4 quarts (1.3 liters) if you do not replace the filter. Always confirm the exact capacity in your manual and check the oil level after filling to the proper mark.


