4into1 Genuine Honda GN4 10W-40 SJ Motorcycle Oil 1 qt — wet-clutch safe, OEM formula

This quart of Genuine Pro Honda GN4 10W-40 SJ delivers a balanced viscosity and an additive package tuned for motorcycle and ATV engines. Developed from premium base stocks and evolved through decades of testing since the original GN4 debut in the 1970s, this oil focuses on shear stability, consistent viscosity, and engine cleanliness under motorcycle-specific loads. It is sold in a 32 fl. oz. (946 ml) bottle and carries Honda OEM part number 08C35-A141M01.

Why choose GN4 10W-40 SJ for my motorcycle?

GN4 10W-40 SJ was engineered to meet the particular demands motorcycle engines place on lubricants, especially where transmission and wet clutches share the crankcase. Its formulation preserves film strength at operating temperatures while helping protect gears and bearings from wear.

• Balanced 10W-40 viscosity for broad temperature performance
• SJ-rated additive chemistry for combustion and deposit control
• Designed for combined engine/transmission systems and wet clutches
• Genuine factory formulation with Honda OEM part number 08C35-A141M01

How does this oil perform in vintage wet-clutch Hondas?

This GN4 formula suits older Honda motorcycles with wet clutches because it avoids friction modifiers that can cause clutch slippage. The product focuses on maintaining proper clutch engagement while protecting the engine and transmission components that share oil.

• Friction profile compatible with wet-clutch systems
• Helps maintain smooth clutch feel and consistent engagement
• Stable under shear to protect vintage engine tolerances

What are the technical specs and how much is in each bottle?

Each container holds one quart (32 fl. oz. / 946 ml) of Genuine Pro Honda GN4 10W-40 SJ. It meets API SJ performance level and carries the specific Honda OEM part number for easy identification and fitment verification.

• Volume: 32 fl. oz. / 1 Quart / 946 ml
• Viscosity grade: 10W-40
• API service category: SJ
• Honda OEM part number: 08C35-A141M01

How should I use and store this Honda GN4 oil?

Use GN4 10W-40 SJ for engine oil changes, following your motorcycle manufacturer’s recommended interval and correct oil capacity. Store the bottle upright in a cool, dry place and keep the cap sealed to prevent contamination and moisture ingress.

• Follow factory-recommended oil change intervals and capacities
• Ensure the engine is warm and drained fully before refilling
• Store sealed upright away from heat and direct sunlight

Who is this for: Riders, restorers and mechanics who need a Honda factory-formulated 10W-40 motorcycle oil—especially owners of classic Hondas with wet-clutch transmissions—will appreciate this genuine GN4 product for its compatibility, labeling with OEM part number 08C35-A141M01, and single-quart convenience.