Honda GN4 10W-40 4-Stroke Motorcycle Oil — Set of 4 Quarts, wet-clutch compatible, OEM spec

Genuine Honda GN4 10W-40 SJ is a factory-formulated 4-stroke motorcycle oil sold here as a set of four 1‑quart (32 fl. oz. / 946 ml) bottles designed for motorcycles and ATVs, including vintage wet-clutch Honda models.

Developed by Honda and continuously refined since its introduction in 1975, GN4 is blended from high-quality base stocks with an additive package tuned for motorcycle and ATV engine demands. This oil balances viscosity stability, shear resistance, and cleanliness to work with wet clutches and transmissions that share engine oil—a common configuration on many motorcycles. Each quart here is the OEM-specified product, part number 08C35-A141M02, supplied as a convenient four-pack for routine maintenance or multi-bike households.

What makes GN4 10W-40 SJ different from car motor oil?

GN4 is engineered specifically for motorcycles, so its additives and friction characteristics are chosen to protect engines while allowing proper clutch engagement. Unlike most automotive oils, GN4 supports wet-clutch operation and the combined lubrication needs of engine and gearbox.

• Formulated for motorcycles and ATVs, not cars
• Compatible with wet-clutch systems for smooth engagement
• Viscosity grade 10W-40 for balanced cold-start flow and high-temperature protection
• API SJ performance level appropriate for many classic and modern engines

How will this 10W-40 oil handle vintage Honda wet-clutch bikes?

GN4 was created with Honda motorcycle requirements in mind and has historically been recommended for many older models with wet clutches. Its friction properties and additive mix help prevent clutch slippage while protecting engine components under the unique loads experienced in motorcycle service.

• Wet-clutch compatible friction modifiers for reliable engagement
• Shear-resistant formulation to maintain viscosity under stress
• Cleaning additives to minimize deposits in classic engines
• OEM part number 08C35-A141M02 ensures genuine Honda specification

How often should I change the oil when using GN4 10W-40?

Change intervals depend on your motorcycle model, riding style, and operating conditions; always follow the schedule in your owner’s manual. For many street bikes, a common recommendation is to replace engine oil every 3,000–5,000 miles, or annually if mileage is low—more frequent servicing may be wise for severe use.

• Check owner’s manual for manufacturer-recommended intervals
• Consider more frequent changes for track use, towing, or dusty environments
• Replace oil filter at each oil change for optimal protection
• Use all four quarts to service multiple bikes or keep spares on hand

What are the practical details of this product pack?

This listing contains four genuine Honda GN4 bottles, each 32 fl. oz. (946 ml). The set is ideal for owners who perform regular maintenance, maintain several motorcycles, or prefer to stock OEM-spec oil for future use.

• Set of 4 x 32 fl. oz. (1 quart / 946 ml) genuine Honda GN4 bottles
• Viscosity: 10W-40, API service category SJ
• Honda OEM Part Number: 08C35-A141M02
• Packaged for easy storage and multiple changes

Who is this for? This four-pack of Honda GN4 10W-40 SJ oil is for riders who want OEM-quality lubrication: owners of Honda motorcycles (especially older wet-clutch models), ATV users requiring motorcycle-grade oil, DIY mechanics servicing several bikes, and anyone preferring factory-formulated fluids. If you need a trusted, motorcycle-specific 10W-40 that aligns with Honda specifications and supports wet-clutch operation, this genuine GN4 set is a practical choice.