Honda TRX300 FourTrax 1999 Oil Change Kit — GN4 10W-40 (3 qt) with OEM Filter & Crush Washer

This kit supplies the exact oils and parts matched to Honda's specifications so you can perform a clean, reliable fluid service on your 1999 TRX300 FourTrax 300. Honda GN4 10W-40 was engineered for motorcycle and ATV wet-clutch applications, blending high-quality base stocks with a motorcycle-specific additive package to protect gears, bearings and clutch components under load.

Why choose GN4 10W-40 for the TRX300?

GN4 oil is a Honda-developed formulation intended for 4-stroke motorcycle and ATV engines where transmission and engine oil are shared. Its chemistry focuses on shear stability, consistent viscosity, and keeping internal components clean during varied riding conditions.

• Viscosity: 10W-40 to cover a wide temperature range for reliable cold starts and hot running.
• Shear resistance: Preserves viscosity under heavy mechanical load.
• Compatibility: Safe for wet clutches and gearbox components in integrated systems.

What exactly is included in this oil change kit?

The kit bundles the essential consumables needed for a standard oil service on the TRX300: three quarts of GN4 10W-40 motor oil, one genuine Honda OEM oil filter, and a crush washer for the drain bolt. That quantity matches Honda's specified oil capacity, allowing proper refill without shortfall.

• 3 quarts Honda GN4 10W-40 motor oil (factory formulation).
• 1 genuine Honda OEM oil filter engineered to Honda tolerances.
• 1 crush washer for a leak-free drain plug seal.
• Oil capacity guidance: 2.8 quarts for full service (kit provides slight extra).

How will this kit affect maintenance and reliability?

Using factory-formulated oil and an OEM filter helps maintain consistent lubrication, reduce wear, and support gearbox and clutch operation in the FourTrax's shared-sump configuration. Regular oil changes with correct parts help preserve engine tolerances and can prevent buildup that reduces performance over time.

• Cleaner internals: additive package helps reduce deposits and sludge.
• Optimal protection: correct viscosity and shear stability for bearing protection.
• Proper sealing: OEM filter and crush washer reduce the chance of leaks post-service.

How do I perform the oil change on a 1999 TRX300?

Basic service requires draining the old oil, replacing the filter, installing a new crush washer on the drain plug, and refilling to the specified capacity. Follow torque specs and run the engine briefly to circulate oil, then recheck oil level when warm on level ground.

• Drain oil completely, replace crush washer on drain plug.
• Remove and replace oil filter with OEM unit; lubricate filter gasket lightly.
• Refill with GN4 10W-40 to ~2.8 quarts, check level after warm-up.
• Dispose of used oil and filter responsibly per local regulations.

Who is this for: This kit is intended for owners and technicians servicing a 1999 Honda TRX300 FourTrax 300 who want factory-spec fluids and parts in a single purchase. It suits DIY mechanics, fleet maintainers, and anyone replacing the oil and filter during routine maintenance to preserve performance and longevity.