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2021 Harley-Davidson FLHR Road King

Engine: 1746

Engine

Oil Change Kit

  • AMSOIL 20W-50 Synthetic V-Twin Oil Change Kit - 5 Quarts with Chrome Filter

    4.9  (1611 Reviews)
    • Combines everything needed to perform an AMSOIL oil change on most 2016-present Harley-Davidson* motorcycles in one convenient package
    • Includes five quarts of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil, one chrome AMSOIL Motorcycle Oil Filter and one drain-plug O-Ring

    *All trademarked names and images 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.

    $137.30

    Retail Price (CAD)

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  • AMSOIL 20W-50 Synthetic V-Twin Oil Change Kit - 5 Quarts with Black Filter

    4.9  (1611 Reviews)
    • Combines everything needed to perform an AMSOIL oil change on most 2016-present Harley-Davidson* motorcycles in one convenient package
    • Includes five quarts of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil, one black AMSOIL Motorcycle Oil Filter and one drain-plug O-Ring

    *All trademarked names and images 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.

    $130.80

    Retail Price (CAD)

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Engine

  • AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

    4.9  (1611 Reviews)
    • Resists viscosity breakdown 6X better than Harley-Davidson* SYN3* for improved protection against compensator and transmission gear wear.1
    • Resists extreme heat to help keep engines clean and efficient.
    • Reduces wear and deposits for maximum engine compression and power.
    • Convenience of one lubricant for all three sumps.

      *All trademarked names and images 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.
      1Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

    $21.29

    Retail Price (CAD)

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Oil Filter

  • AMSOIL Black Oil Filter

    4.9  (3329 Reviews)
    • 99% efficiency at 20 microns1 for maximum protection against engine wear
    • Help extend engine life
    • Help improve performance
    • Fluted for easy removal

      1In accordance with industry-standard ISO SO 4548-12.

    $19.55

    Retail Price (CAD)

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  • AMSOIL Chrome Oil Filter

    4.9  (3329 Reviews)
    • 99% efficiency at 20 microns1 for maximum protection against engine wear
    • Help extend engine life
    • Help improve performance
    • Fluted for easy removal

      1In accordance with industry-standard ISO SO 4548-12.

    $37.75

    Retail Price (CAD)

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Transmission

Transmission

  • AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

    4.9  (1611 Reviews)
    • Resists viscosity breakdown 6X better than Harley-Davidson* SYN3* for improved protection against compensator and transmission gear wear.1
    • Resists extreme heat to help keep engines clean and efficient.
    • Reduces wear and deposits for maximum engine compression and power.
    • Convenience of one lubricant for all three sumps.

      *All trademarked names and images 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.
      1Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

    $21.29

    Retail Price (CAD)

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  • AMSOIL 100% Synthetic V-Twin Transmission Fluid

    4.9  (485 Reviews)
    • Protects against gear and bearing wear
    • Delivers smooth shifts
    • Helps eliminate loud thunks and gear noise
    $26.59

    Retail Price (CAD)

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Differential/Transfer Case

Primary

  • AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

    4.9  (1611 Reviews)
    • Resists viscosity breakdown 6X better than Harley-Davidson* SYN3* for improved protection against compensator and transmission gear wear.1
    • Resists extreme heat to help keep engines clean and efficient.
    • Reduces wear and deposits for maximum engine compression and power.
    • Convenience of one lubricant for all three sumps.

      *All trademarked names and images 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.
      1Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

    $21.29

    Retail Price (CAD)

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  • AMSOIL 100% Synthetic V-Twin Primary Fluid

    5.0  (528 Reviews)
    • 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
    $22.59

    Retail Price (CAD)

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Other Fluids

Hydraulic brake/clutch system

No recommendations available

Hydraulic brake system

No recommendations available

Shock absorber

  • AMSOIL Shock Therapy® #10 Medium Suspension Fluid

    5.0  (11 Reviews)
    • High viscosity index helps prevent fade under extreme temperatures
    • Consistent, smooth damping
      • Seal conditioners for extended service life
    • Race-grade technology
    $25.49

    Retail Price (CAD)

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Seasonal Storage

Products

  • AMSOIL Gasoline Stabilizer

    • Helps keep fuel fresh up to 12 months
    • Protects against varnish and gum buildup
    • Fights ethanol corrosion
    • Ideal for stored seasonal equipment such as snowmobiles, lawnmowers, motorcycles and boats
    $21.19

    Retail Price (CAD)

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ADDITIONAL PRODUCTS

  • AMSOIL Motorcycle Octane Boost

    • Increases octane up to three numbers
    • Maximizes power & performance
    • Helps eliminate engine knock & ping
    • Cleans harmful deposits
    $9.39

    Retail Price (CAD)

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  • AMSOIL Quickshot® Gasoline Treatment and Stabilizer

    • Cleans powersports fuel systems
    • Addresses ethanol-related performance issues
    • Stabilizes fuel during short-term storage
    $17.89

    Retail Price (CAD)

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  • AMSOIL MP Metal Protector

    • Cuts through rust and frees frozen components
    • Helps protect against rust and corrosion, even in salt water
    • Displaces water
    • Stops squeaks
    • Lubricates moving parts
    $11.39

    Retail Price (CAD)

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  • AMSOIL High-Foam Car Shampoo

    • High-foam formula is hard on dirt, gentle on coatings and finishes
    • Bucket-wash, foam-gun and foam-cannon capable
    • Breaks down contaminants and road grime
    • Anti-static
    $19.59

    Retail Price (CAD)

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  • AMSOIL Exterior Ceramic Spray

    • Easy application
    • Requires no cure time
    • Sheds water rapidly
    • Protects against UV rays
    $28.29

    Retail Price (CAD)

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Your 2021 Harley-Davidson FLHR Road King Motor Oil

AMSOIL synthetic lubricants are the solution for drivers who want the most from their 2021 Harley-Davidson FLHR Road King. How good are they? Our synthetic motor oils blow the doors off the highest industry standards.

Protect your Harley-Davidson FLHR Road King in any driving condition with our specially formulated motor oils. Whether it’s extreme temperatures, long commutes, towing, hauling, the added stress of a turbocharger or you’re simply extending the time between oil changes, our motor oils will keep your 2021 Harley-Davidson FLHR Road King protected.

We produce the synthetic motor oil, oil filter, transmission fluid, gear lube and grease for a complete fluid change – everything to keep your Harley-Davidson FLHR Road King running smoothly for the long haul.

Industry-Tested, Driver Approved

AMSOIL products are subjected to rigorous third-party, industry-standard testing so you can rest assured you’re getting maximum protection. Also, check out our customer reviews on amsoil.com to make the best choice for your Harley-Davidson FLHR Road King. Hear from more than 6,000 customers who have experienced AMSOIL lubricants.

2021 Harley-Davidson FLHR Road King Transmission Fluid

Using a properly formulated transmission fluid for your Harley-Davidson FLHR Road King can protect your vehicle from costly problems down the road. AMSOIL transmission fluids offer the best protection for your Harley-Davidson FLHR Road King, even in the most severe driving conditions. Protect your vehicle’s transmission from wear, sludge and temperature-related problems and drive with confidence.

Shop Online and Get Fast, Free Delivery

Shop online and get your products in 3 business days or less. With free shipping on orders over $130, and an average 25% savings for Preferred Customers, shopping online is the fastest way to get AMSOIL products to your doorstep. Becoming a Preferred Customer earns you savings, points on purchases and more. Simply shop amsoil.com and add a P.C. membership to your cart before checking out. You will receive an immediate savings on products for your 2021 Harley-Davidson FLHR Road King.

Find an AMSOIL Dealer or Retailer Near You

Getting products for your 2021 Harley-Davidson FLHR Road King couldn’t be easier. Find a nearby Independent AMSOIL Dealer or retailer using the AMSOIL Locator.

AMSOIL Disclaimer and Technical Concerns

Specifications contained on this website are based on manufacturers' information and were believed accurate at the time of publication. Our recommendations apply to AMSOIL products only, as we cannot be responsible for products from other manufacturers. Always compare fluids and lubricants that were installed in the vehicle with those replacing them during service. Never install more fluid or lubricant than what is considered adequate according to gradients on dipstick or level of filler hole. Fill and drain locations are for reference only. Failure to perform adequate inspections or obtain proper resolution will limit or negate any liability toward AMSOIL INC. Models introduced midyear may not have the same specifications as those produced earlier.

If any discrepancies are noted, they can be simply reported to AMSOIL by clicking on the "Problem?" link docked to the left. We review all reported problems, if you would like a personal response to the issue you are reporting please enter your email address in the space provided on the form.