Engine oil and drive-system oil are specified separately for the 2017 Honda FourTrax Rancher 420. In short, use Honda GN4 10W-40 engine oil (10W-30 is acceptable in very cold environments); the engine oil capacity is about 2.0 liters, and the drive gear cases require GL-5 gear oil such as 80W-90. Always verify exact specifications in the owner’s manual for your specific vehicle and climate.
The Rancher 420 is a mid-size, four-stroke ATV with shaft drive, so you’ll be servicing both the engine oil and the gear oil for the front and rear drive cases. The following sections summarize official recommendations and practical guidance to help you choose the right oils and keep the machine running smoothly.
Engine oil specifications
Key engine oil options include viscosity choices, oil type, and service intervals.
- Viscosity: 10W-40 is the standard recommendation for most riding conditions; 10W-30 can be used in very cold climates to aid starting and flow.
- Oil type and brand: Honda GN4 10W-40 is the typical factory-recommended oil; high-quality 4-stroke ATV/UTV oils meeting API SJ/SL/SM (or newer) specifications are acceptable if they are equivalent to or better than GN4 in performance.
- Engine oil capacity: approximately 2.0 liters (about 2.1 quarts) when performing a full oil change with filter replacement.
- Change interval: generally every 100 hours of use or once a year, whichever comes first; always follow the mileage/hour guidance in your owner’s manual and inspect oil condition regularly.
Choosing the right engine oil supports proper lubrication of the camshaft, bearings, and piston rings, and helps maintain engine performance across seasonal riding conditions.
Drive gear oil specifications
Details for the drive system oil protect the front and rear gear cases that power the Rancher 420’s shaft drive.
- Oil type: GL-5 gear oil is recommended for the drive gear cases; common choices include 80W-90 or 75W-90 viscosities depending on climate and load expectations.
- Front and rear gear cases: both typically require gear oil, but capacities are small and vary by model and year; refer to the service manual for exact fill quantities for your unit.
- Oil change considerations: use fresh gear oil and avoid mixing with engine oil; check seals and drain plugs for leaks during service.
Keeping the drive gear oil within spec helps protect the differential and final drive components from wear, especially under heavy loads or high-heat riding conditions.
Notes and practical tips
Always consult the official owner’s or service manual for your specific VIN and production date to confirm exact oil grades, capacities, and service intervals. Honda Genuine Motor Oil or high-quality equivalent oils that meet or exceed the indicated specifications are acceptable. If you ride in extreme temperatures or do heavy-duty work, your maintenance schedule may adjust accordingly.
Bottom line
For a 2017 Honda Rancher 420, the engine should use 10W-40 (or 10W-30 in very cold climates) engine oil, about 2.0 liters per change, and GL-5 gear oil such as 80W-90 for the drive gear cases. Always verify the precise requirements in your owner's manual and use high-quality oils that meet the specified standards.
Summary
The 2017 Honda Rancher 420 requires separate oils for its engine and drive system. Engine oil: GN4 10W-40 (10W-30 in cold weather), ~2.0 L per change, with changes roughly every 100 hours or annually. Drive gear oil: GL-5 gear oil (80W-90 or 75W-90), with small-capacity fills for the front and rear gear cases; check the manual for exact amounts. Following these guidelines helps protect the engine and drive components across seasons and riding conditions.