Harley Transmission Oils

High-performance transmissions demand oil engineered for extreme conditions—DRAG OIL 80W-140 delivers the extreme pressure protection and thermal stability your Big Twin needs to shift smoothly under sustained heat and high RPM loads. Whether you're...

Your Big Twin's primary drive demands an oil formulated specifically for the unique pressures and temperatures of wet-clutch systems. DRAG Oil Primary Drive Oil delivers the film strength and thermal stability needed to protect your clutch, transmission,...

Harley-Davidson Big Twin transmissions demand oil engineered specifically for their unique demands—and DRAG OIL 80W-90 delivers exactly that. This high-performance mineral formula provides the film strength and viscosity stability needed to keep your...

Your H-D primary case and transmission demand oil engineered for the extreme pressures and temperatures of high-performance riding. MAXIMA Racing Oil V-Twin Synthetic delivers the protection and shifting consistency that separates reliable operation from...

If you're running a Big Twin with a wet diaphragm clutch, using the wrong primary oil will cost you in performance and component longevity. MAXIMA Racing Oil V-Twin Primary Drive Oil is engineered specifically for the demands of high-performance...

Harley-Davidson and V-Twin transmission performance demands a gear oil engineered for the extreme pressures and shock loads unique to big-displacement engines. MAXIMA Racing Oil 80W-90 delivers the film strength and extreme pressure additives necessary...

If you're running a Big Twin transmission at the edge of performance limits, standard oils won't cut it—you need a formula engineered for extreme pressure and shock loads. MAXIMA Racing Oil V-Twin 85W-140 delivers the film strength and anti-wear...

Proper transmission fluid is non-negotiable for Sportster® reliability and performance. BEL-RAY Sport Transmission Fluid is specifically formulated to prevent clutch slipping and chatter while protecting internal wear surfaces under sustained load. The...

Big Twin transmissions demand oil engineered specifically for dry-clutch gearboxes—standard motor oil won't cut it. Bel-Ray's formulation delivers the wear protection and anti-scuff additives your transmission needs to handle sustained shift cycles and...

Harley-Davidson Sportster transmissions demand synthetic protection that can handle extreme heat cycles and shock loading without breaking down. The Klotz KH-S80 is engineered specifically for your bike's unique gear and chain requirements, delivering...

Proper transmission fluid is non-negotiable for Big Twin longevity—the right oil reduces wear on gear teeth, minimizes noise during shifts, and prevents costly internal damage. BEL-RAY's formulation is engineered specifically for dry-clutch Big Twin...

Your Big Twin primary chaincase demands lubrication that matches the demands of modern riding—synthetic formulations protect against heat breakdown and extend component life far beyond conventional oils. S&S Cycle's full-synthetic primary oil delivers...