AMSOIL Synthetic V-Twin Primary Fluid
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Purpose-Built Primary Chaincase Lubricant
AMSOIL Synthetic V-Twin Primary Fluid is purpose-built for bikers who prefer a dedicated primary chaincase lubricant. Its balanced formulation delivers consistent clutch feel for confident starts, helping riders avoid killing the engine. It also protects components against wear to help riders get the most out of their bikes.
AMSOIL Synthetic V-Twin Primary Fluid is Warranty Secure and will not void your motorcycle's warranty. It is a cost-effective, high-performance alternative to original equipment manufacturer (OEM) fluids.
Key Benefits
- Purpose-built for primary chaincases — not a multi-use compromise
- Delivers consistent clutch feel for confident starts
- Helps prevent clutch slip with superior load-holding capacity
- Helps riders easily find neutral
- Protects compensator bearing, chain and gears against wear
- Thermally stable — helps reduce operating temperatures
- Maximizes energy efficiency in cold-temperature riding
- Warranty Secure — keeps factory warranty intact
Consistent Clutch Feel and Component Protection
AMSOIL Synthetic V-Twin Primary Fluid is formulated with a balanced additive system that provides consistent clutch performance and feel. It helps riders easily find neutral and promotes smooth acceleration, whether in stop-and-go city conditions or when on the highway. Its superior load-holding capacity helps prevent clutch slip for confident starts.
It contains a heavy dose of anti-wear additives to protect the gears, chain and compensator bearing from premature wear. Its superior film strength helps protect against shock-loading, promoting reduced wear and longer component life.
In extreme heat, its thermally stable synthetic formulation naturally resists the harmful effects of thermal breakdown, helping components stay cool and achieve optimum performance and life.
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 18.8 |
| Kinematic Viscosity @ 40°C, cSt | 147.9 |
| Viscosity Index | 144 |
| Pour Point | -35°C (-31°F) |
| Flash Point | 238°C (460°F) |
| Fire Point | 258°C (496°F) |
| Four-Ball Wear Test Scar, mm | 0.37 |
| JASO T 904 Friction Test | MA/MA2, Pass |
Industry Certifications & OEM Approvals
JASO
- MA/MA2 (T 904 Friction Test)
Applications & Recommendations
Use in Harley-Davidson, Triumph and pre-2013 Indian bikes.
AMSOIL Synthetic V-Twin Primary Fluid is recommended for up to 10,000 miles (16,000 km) or one year, whichever comes first.
Pros and Cons
Pros
- Purpose-built for primary chaincases — not a multi-use compromise
- Delivers consistent clutch feel for confident starts
- Helps prevent clutch slip with superior load-holding capacity
- Helps riders easily find neutral
- Protects compensator bearing, chain and gears against wear
- Thermally stable — helps reduce operating temperatures
- Maximizes energy efficiency in cold-temperature riding
- Warranty Secure — keeps factory warranty intact
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Order Through Your Independent AMSOIL Dealer
Give your primary chaincase dedicated protection. As your Independent AMSOIL Dealer, we provide expert guidance and competitive pricing on all AMSOIL products.
Independent AMSOIL Dealer #1858536
Shipping & Returns
Fast, Reliable Shipping
- Free standard ground shipping on orders of $100 ($130 in Canada) or more.
- Orders under the threshold ship for a flat $9.99 ($12.99 in Canada) freight charge.
- In-stock items typically delivered in two to three business days.
- U.S. and Canada only — no shipments to PO Boxes.
30-Day Return Policy
- Return unopened, currently marketed products within 30 days for a full refund (minus freight).
- Exchange unopened products within 90 days with no restocking fee.
- Special-order items are non-returnable.
- Returns are handled directly by AMSOIL.
Frequently Asked Questions
AMSOIL Synthetic V-Twin Primary Fluid is purpose-built for primary chaincases with a balanced additive system specifically formulated for consistent clutch feel and compensator protection. While the 20W-50 V-Twin Oil works well as a multi-use lubricant in all three sumps, the dedicated Primary Fluid is optimized for riders who want the best possible clutch performance and chaincase protection.
AMSOIL Synthetic V-Twin Primary Fluid is designed for use in Harley-Davidson, Triumph and pre-2013 Indian bikes that have a separate primary chaincase requiring its own lubricant.
AMSOIL recommends changing Synthetic V-Twin Primary Fluid at up to 10,000 miles (16,000 km) or one year, whichever comes first.
Customer Reviews
See all 520 reviewsExcellent product
Excellent product. Smooth clutch performance and little to no wear noticed from the compensator
Nothing Better on the Market
Switching from Harley’s promotional fluid to a real synthetic primary fluid, Amsoil provides smoother clutch, quieter primary and better fuel economy. Use it, you won’t be let down!
Great clutch grab, maybe too great.
Switched to a dedicated Primary lube, due to the OEM Synthetic taking out the transmission roller bearing on a long trip and no longer using one in all three. Noticeably smoother and less chain slap when shifting. One note though is the clutch really locks in so you need to have it adjusted correctly and pull it all the way in especially for 1st and 2nd.
V-twin PRIMARY Fluid
Disappointed. I love Amzoil and most of their products, but this one just hasn't seemed to keep up with current practices. Even Harley has come out with a new updated Heave Duty Primary Fluid, and the 80w-140 range. But Amzoil has not. They don't even list the viscosity on this old oil. Time to get a new Heavy Duty Primary Oil out there, Amzoil. A lot of us v-twin customers are waiting for you to update and come out with something better than Harley.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.