Honda GN4 Motor Oil 10W30 - 4 Quart Pack - Genuine Honda Part

Our review of the Honda GN4 Motor Oil 10W30 explains why this genuine Honda oil is best for riders who want a factory-recommended lubricant that matches Honda warranty and performance specifications. Packaged as four 1-quart bottles under OEM part number 08C35-A131M02, the oil stands out for its shear-stable polymer additives and high-quality base stocks that resist viscosity breakdown in heat and heavy use. This makes it particularly appealing for owners of modern Honda 4-stroke motorcycles, ATVs, scooters and small watercraft who prefer an OEM solution that meets Honda R&D standards.

Key Features

• OEM Part Number: The included part number 08C35-A131M02 ensures compatibility and peace of mind for owners seeking factory-approved oil.
• Shear-Stable Additives: A unique blend of shear-stable polymers helps the oil maintain viscosity under high mechanical stress and elevated temperatures.
• Wide OEM Approval: Approved for use in Honda 4-stroke motorcycles, ATVs, scooters, watercraft and MUVs, simplifying maintenance across multiple machines.
• API Service SJ Compliance: Meets API SJ requirements, providing suitable protection for engines designed around that classification.
• Pack of Four: Supplied as a 4-quart pack, it is convenient for bikes needing multiple quarts or for owners who prefer three-to-four oil changes worth of supply on hand.
• Engine and Gear Use: Can be used as engine oil and, in specified models, as a gearbox/transmission lubricant, reducing the need for separate products.

Who It's For

This oil is aimed at Honda owners and mechanics maintaining 4-stroke Honda motorcycles from 2006 and newer, plus a range of Honda ATVs, scooters and MUVs that recommend 10W30 in their Owner's Manual. Riders who value OEM-specified fluids and who perform routine maintenance themselves will appreciate the factory approval and the convenience of a four-quart pack.

Customers looking for a budget synthetic blend for extreme racing conditions or those requiring different viscosity grades for very cold climates should consult their Owner's Manual or consider alternatives; this 10W30 formulation is optimized for the Honda-recommended range rather than specialized motorsport applications.

Pros & Cons

Pros

• Genuine Honda formulation and part number provide assured compatibility with Honda machines and warranty expectations.
• Customers report good oil quality and value for money, noting it performs well for standard engine lubrication.
• Shear-stable polymer additives help maintain viscosity under heavy use, reducing thermal breakdown risk.
• Versatile approval for engine and certain gearbox uses reduces the need for separate specialized fluids.

Cons

• Only available in 10W30 in this pack, so owners needing other viscosities must buy a different product.
• Not marketed as a high-end full synthetic for extreme racing; users with those needs should seek race-specific oils.

Specifications

Brand	Honda
Product	GN4 Motor Oil 10W30
Quantity	Pack of 4 quarts
OEM Part Number	08C35-A131M02
API Rating	Meets API service SJ
Intended Use	Honda 4-stroke motorcycles, ATVs, scooters, watercraft, MUVs
Also Usable As	Gearbox/transmission lubricant for specified Honda 2-stroke models

Our Verdict

The Honda GN4 10W30 four-quart pack is a practical, OEM-approved choice for Honda owners who want a reliable, factory-specified motor oil that balances quality and value. It excels for routine maintenance on modern Honda 4-stroke machines and simplifies inventory for multi-vehicle owners, though riders needing alternate viscosities or race-grade synthetics should look to other specialized oils.

Frequently Asked Questions

Is this oil genuine Honda OEM?
Yes, it is sold as genuine Honda GN4 motor oil with OEM part number 08C35-A131M02.

Can this be used in the gearbox?
It is approved as a gearbox/transmission lubricant for certain Honda 2-stroke motorcycles as specified by Honda; consult the Owner's Manual for model-specific guidance.

Which machines is this suitable for?
It is suitable for Honda 4-stroke motorcycles, ATVs, scooters, watercraft and MUVs that recommend 10W30; check your Owner's Manual for the correct viscosity.