Synthetic V-Twin Primary Fluid

AMSOIL Synthetic V-Twin Primary Fluid is purpose-built for bikers who prefer a dedicated primary chaincase lubricant. (Don’t tell anyone but it’s a SAE 50)

Helping motorcyclists finding neutral since 2008.

Synthetic V-Twin Primary FluidAMSOIL V-Twin Synthetic Primary Fluid is purpose-built for bikers who prefer a dedicated primary chaincase lubricant. Its balanced formulation delivers consistent clutch feel for confident takeoffs, helping riders avoid killing the engine. It also protects components against wear to help riders get the most out of their bikes. V-Twin Synthetic 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.

All you need is a credit card or find a local dealer and he’ll be glad to take you cash.

Delivers Consistent Clutch Feel & Smooth Acceleration

V-Twin Synthetic SAE 50 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 takeoffs. She says, “You gotta try it.”

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Call 800-579-0580 for competitive current price.
Or use the online preferred customer portal if you choose to order online.

Printable Product Data Sheet for Synthetic V-Twin Primary Fluid.Synthetic V-Twin Primary Fluid.

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Protects Against Chain, Gear & Bearing Wear

V-Twin Synthetic Primary Fluid 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.

Helps Reduce Operating Temperatures

In extreme heat, V-Twin Synthetic Primary Fluid’s thermally stable synthetic formulation naturally resists the harmful effects of thermal breakdown. It helps components stay cool and achieve optimum performance and life.

Maximizes Energy Efficiency

V-Twin Synthetic Primary Fluid’s balanced formulation reduces energy lost to drag in cold-temperature riding conditions. It promotes smooth shifts at startup and maximizes energy efficiency.

  • Delivers consistent clutch feel for confident takeoffs
  • Helps prevent clutch slip
  • Provides smooth acceleration
  • Helps riders easily find neutral
  • Protects compensator bearing, chain and gears against wear


Harley Davidson®, Triumph® and pre-2013 INDIAN® bikes.

*All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are AMSOIL-engineered for use in the applications shown.


V-Twin Synthetic Primary Fluid is recommended for up to 10,000 miles or one year, whichever comes first.


AMSOIL V-Twin Synthetic Primary Fluid is Warranty Secure, keeping your factory warranty intact. AMSOIL V-Twin Synthetic Primary Fluid is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the AMSOIL Limited Warranty (G1363). For details, visit

warranty safe


This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available via the Internet at or upon request at 715-392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

Customer Testimonials

Synthetic V-Twin Primay Fluid

I Wouldn’t Run Anything Else in My Primary Now! Dramatic Improvement in Clutch Feel and No More Noisy “CLUNK” when Shifting into 1st Gear from Neutral! So Much Easier to Find Neutral Running this Product and Shifts are Improved also… Great Job Amsoil!

Cool Running’s

It’s pretty simple, there are two things that will kill any V-twin engine, heat and friction. So engine oil is one of the most important things to consider, because it has to eliminate friction and be able to withstand high temperatures without breaking down. I use AMSOIL because it is the best lubricant available, and to help it so it’s job, I use Love Jugs cooling fans to keep my engine from ever overheating. Between those two things I can feel confident on a long and trouble free engine in my 2012 FLTRU. I also use AMSOIL transmission oil and Primary oil and now have over 48,000 trouble free miles on my ride.

We are talking HOT!!!!

Prior to setting out with my sons on our annual motorcycle trip, I changed the oils in our Harley Davidson touring bikes, a CVO Ultra, CVO Road King and a Screaming Eagle 103 stage 4 Road King. We used AMSOIL V-Twin Primary, V-Twin Tranny and 20w-50 Synthetic V-Twin engine oils. We then proceed on a two week, 3500 mile journey through Arizona, Nevada, and California in temperatures ranging from 38 degrees to record breaking heat as high as 118 in Death Valley CA. A few days the temperature never dropped below 100 degrees. Averaging 300 miles a day, the HDs performed perfectly. While others in our group of 14 bikes had a variety of lubricant related problems, our AMSOIL equipped motorcycles had zero issues. Not surprised, I’ve been using AMSOiL products since the late ’70 and have never experienced a lubrication related failure with any of my vehicles or equipment.