YAMAHA Yamalube 20W-50 4-Stroke Engine Oil - 1 Gallon, JASO MA Wet-Clutch Safe

Yamaha Yamalube All Purpose Performance 4-Stroke 20W-50 is a mineral-based engine oil formulated to protect 4-stroke motorcycle, ATV, UTV and scooter engines while maintaining reliable wet-clutch performance.

This one-gallon jug of YAMAHA Yamalube LUB-20W50-AP-04 blends high-quality mineral base stocks with ultra-clean additive chemistry to reduce friction, control wear and help preserve engine life under normal riding conditions. Designed by Yamaha for Yamaha machines but suitable across many brands, the oil meets or exceeds JASO MA standards to ensure proper operation of wet clutches common to motorcycles and many off-road vehicles.

How does this oil support wet-clutch performance?

The Yamalube All Purpose 20W-50 is formulated to meet JASO MA specifications, which target friction properties appropriate for wet-clutch systems. That means clutch plates engage smoothly without slipping or grabbing when oil is present in the gearbox and primary drive.

• JASO MA rated for correct frictional behavior
• Balanced additive package to avoid clutch chatter
• Stable film strength under normal operating temperatures

What engines and vehicles is this oil suitable for?

This oil is specified for 4-stroke motorcycle engines but is also well-suited for ATVs, side-by-sides (UTVs) and scooters that call for a 20W-50 viscosity and JASO MA compatibility. It performs best in naturally aspirated and lightly stressed engines used in daily riding, commuting and recreational off-road use.

• Motorcycles with wet clutches and gearbox-in-sump designs
• ATVs and UTVs requiring 20W-50 viscosity
• Scooters and small displacement 4-stroke engines using mineral blend oils

What protection and performance can I expect?

The performance-blended mineral base and cleaner additives deliver good anti-wear and antifriction properties for everyday use. You can expect reliable cold-start protection within the viscosity range and consistent lubrication that helps reduce engine wear from daily riding demands.

• Anti-wear additives to protect bearings and cam surfaces
• Friction modifiers tuned for smooth shifting and clutch feel
• Viscosity stability to maintain oil film across common temperature ranges

How often should I change this oil and what quantity do I get?

This product ships as a one-gallon container (128 fl oz), providing multiple fill-ups for most motorcycles or several changes for ATVs depending on capacity. Follow your vehicle manufacturer’s service intervals for drain and fill frequency—typical motorcycle intervals range based on use and riding conditions.

• Includes one (1) gallon / 128 fl oz per unit
• Quantity covers multiple small-capacity fill-ups or several larger ones
• Adhere to Yamaha or vehicle-specific service schedule for change intervals

Who is this for: Riders and owners who want a Yamaha-specified, mineral-blend 20W-50 oil built for everyday street and light off-road use. It’s ideal for those maintaining older or higher-mileage 4-stroke bikes, ATVs and UTVs that benefit from a durable, JASO MA-rated oil designed to preserve wet-clutch performance without the premium cost of some full-synthetic alternatives. Use this if your machine’s handbook lists 20W-50 viscosity and JASO MA compatibility, or when you prefer a Yamaha-approved product for routine service.