Best Oil for Harley Transmission – A List from The Expert for 2023

Oil for Harley Transmission

Oil is required for the continuous lubrication of all engines. Transmission oil ensures the structural integrity of all sensitive and critical components. The oil is the source of pollutant exhaustion that keeps the engine working smoothly.

Harley Davidson motorcycles are among the most desirable. They are well-known for being the best in the business when it comes to touring and cruising.

Because your Harley-Davidson motorbike is air-cooled, it may heat up faster than a water-cooled motorcycle. The finest Harley transmission oil guarantees that the motor works at the optimal temperature.

ImageProduct NameEditor's RatingPrice

Red Line 42804 V-Twin Transmission Oil
Red Line 42804 V-Twin Transmission Oil

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Red Line 90226 V-Twin 20w50 PowerPack Oil
Red Line 90226 V-Twin 20w50 PowerPack Oil

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Bel-Ray Big Twin Transmission Oil
Bel-Ray Big Twin Transmission Oil

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Spectro Oil R.HDPG6
Spectro Oil R.HDPG6

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Maxima Racing Oils
Maxima Racing Oils

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Best Oil for Harley Transmission Reviews

Choosing the proper oil for your Harley Davidson is essential. You could believe that all motorbike engines are the same and that the same terminology can be applied to all brands. Consider again! When it comes to motor oil engine, certain manufacturers are picky.

1. Red Line 42804 V-Twin Transmission Oil

Hearing the gearbox make a noise as if it may come out on your next gear shift can be upsetting for a motorcycle rider. To be safe, make sure your engine is well-lubricated and that the oil it uses can withstand high temperatures.

This motor oil is primarily designed for use in four-stroke ATVs and motocross. It is known for being shock-proof due to how efficiently it dampens noise coming from the transmission. The oil reduces the shifting clunk in the gears, hence minimizing the sound.

The oil forms thick coatings between the gear teeth, reducing friction. This oil is also important for the smooth changing of gears.

The strong thickness protects the gear due to the viscosity properties of the oil. With such protection, friction is lessened, allowing for longer periods of use before wear and tear become obvious.

Using this synthetic oil not only allows you to go further before needing to change your oil, but it also ensures that your engine remains in good condition throughout this extended period. Oil flows throughout the engine, keeping it clean by collecting dirt and debris that may damage the engine.

Furthermore, the oil helps to lower the temperature, reducing the possibility of overheating, which may be damaging to the performance of your motorcycle.

Another distinguishing aspect of this oil is its pink tint. This hue makes any leakage more visible to the driver. Check out our oil instructions for the Duramax engine as well. Besides, you can choose some Woodworking Jigs.

Highlighted Characteristics

  • Simple gear changing
  • Extremely effective
  • Viscosity is extremely high.
  • Reduce the temperature to avoid overheating.

2. Red Line 90226 V-Twin 20w50 PowerPack Oil

If you’re a serious cyclist, this oil powerpack will come in handy. It is not only cost effective, but it also performs well. The motorbike chain oil is a significant bonus for first-timers. Chain oils are frequently mistaken with inferior oils.

This synthetic engine oil works better than typical in warm climates. The oil composition aids in keeping the engine’s temperature at an all-time low. Even at low temperatures, the oil’s viscosity remains unaffected.

If you are an average user, this oil performs a better job of securing the position for V-Twin engine bikes.

This tune-up package contains everything you might possibly need to ensure that your engine operates smoothly and effectively. It will provide you a smoother ride, with simpler gear shifts and less rattling.

Everything you need to change your own oil is included in the package, including a bottle of Supercool with WaterWetter, a bottle of Fuel Injection Cleaner for Motorcycles, 5 gallons of 20W50 Motorcycle Oil, a beginning kit, a flexible funnel, and a Red Line Oil embroidered cap.

Each kit contains enough fluids for a thorough replacement, but double-check the motor’s capacity to prevent overfilling it with oil. Check out the most important 80W90 Gear Oil automotive components. Make sure you also check our guide for Glow Plugs For Duramax.

Highlighted Characteristics

  • Gear oils and high-revving four-stroke motor oils
  • Motor lubricants have a high concentration of zinc and phosphorus for anti-wear.
  • Excellent friction modifier for improved wet-clutch performance.
  • Ester and PAO base stocks are used in the production of full synthetic oil.
  • High-temperature thinning is reduced with gear oil.

3. Bel-Ray Big Twin Transmission Oil

If you’re seeking for transmission oil that will not only provide smooth gear changing but also enhance horsepower, this one is for you.

Its maker is recognized for overall performance items, and this one is designed exclusively for V-Twin Engines like the Harley Davidson.

The multigrade transmission oil contributes to quieter gear engagement and smoother shifts.

It features innovative additives and superb chemistry to reduce friction and protect delicate components from stress.

The excellent quality of index oils, due to the specific additives, offers oxidation protection and helps preserve film strength in a wide range of temperatures, even high levels.

The same additives decrease slide friction, resulting in extraordinarily quiet and smooth gear changing.

This oil is especially designed for final drivers and Big Twin transmissions that require hypoid gear oil – standard and restricted differential on slips and driveshaft transmissions. Because the viscosity resists the breakdown produced by gear shearing, there is also improved shear stability.

The improved lubrication of the oil allows for optimum horsepower by minimizing sliding friction and enabling maximum power in the motor.

Furthermore, the striking red color aids the rider in detecting leaks.

Highlighted Characteristics

  • Maximum horsepower and quieter gear engagement
  • Oil with severe pressure chemistry protects gears against stress loading.
  • Color distinction for leak detection
  • Temperature effects on film strength

4. Spectro Oil R.HDPG6

This one-of-a-kind oil and lubricant were created and made exclusively for Harley drivers who dislike the noise that comes from their gearbox. It enables for smoother shifting, eliminates clunking, and decreases fifth-gear whining.

Furthermore, its patented G4 technology and specific additives provide extra anti-wear protection, improved film strength in the gears, and reduced drag while extending gear life. Slipping and clutch drag are reduced by low friction, low drag loss viscosity.

Unlike other oils, the severe heat and heavier load have no effect on the oil, allowing it to work optimally when pushed hard. It comprises an unique polymer that promotes thermal stability and great clutch engagement.

This synthetic oil is also noted for its ability to function in all weather situations, at extremely high temperatures, and under enormous loads.

Furthermore, this oil would last for thousands of miles before needing to be changed. As the engine rotates, it accumulates dirt and debris, ensuring that it is always clean.

Highlighted Characteristics

  • It is ideal for long-distance truckers since it performs in high temperatures and under large loads.
  • G4 technology and additives guard against wear and strain on the gear and bearings.
  • Circulating oil cleans the engine by catching particles and reducing harm to the engine.
  • Silent and smooth gear changing, with less whining in 5th gear

5. Maxima Racing Oils

Every rider need a trustworthy oil that will protect the engine and its components. Look for one that provides smooth riding while also extending the life of your engine.

This oil is ideal for your Harley since it is mineral-based and concentrates on 4, 5, and 6-speed high-performance gears.

It features a strong and shear-stable formulation that is especially intended for the Harley gearbox or any twin V model without wet-clutches.

This oil has a high film strength and provides resistance to viscosity loss, shock, loads, and general wear. Smooth shifting under peak RPMs and loads is feasible with severe pressure additions and surface-active chemistry.

Additionally, it contains ultra-clean detergents that prevent the gears from deposits and wear, allowing for a trouble-free operation.

This mineral oil is created with a high-performance composition to improve motorcycle performance in harsh and high-stress scenarios.

When combined with religious maintenance, you can be certain that your motorbike will get you where you need to go and will not break down in the middle of a journey.

Highlighted Characteristics

  • Mineral-based transmission oil
  • Ideal for high-performance gearboxes with 4, 5, and 6 speeds.
  • High film strength gives exceptional resistance to shock loads, wear, and viscosity loss.
  • For smooth shifting at high RPMs and peak loads, use extreme pressure additives and active chemistry.
  • Detergents are ultra-clean and prevent gears from wear, allowing for trouble-free operation.

Things to Consider Before Buying Oil for Harley Transmission

Best Oil for Harley Transmission

Any vehicle, particularly motorcycles, is subjected to the full force of the road. To ensure that your engine performs optimally, you must ensure that the oil used to keep it running is of the highest quality.

When changing your oil, keep the following points in mind:

Motorcycle Oil Type

There are three types of motor lubricants available: mineral oil, full synthetic, and semi-synthetic.

Mineral oil is a refined form of crude oil. It may be less stable and unsuitable for cars operating at greater temperatures.

Full synthetic oil is a mixture of several chemicals. This should result in better performance.

Semi-synthetic oil is a blend of synthetic and crude oil. It completes the task without breaking the bank.

Nobody wants to put oil in their bike that isn’t designed for it. Make certain that you use the proper sort of transmission oil.


The viscosity of an oil is the rate at which it flows. The lower the viscosity, the freer and faster the oil flows, whereas the greater the viscosity, the reverse effect occurs. Using the incorrect viscosity might result in metal on metal grinding.

Cleaning Capabilities and Additives

These additives clean the engine by removing dirt and acid. Along with them, muck can build, especially if the engine is used frequently.

Cleaning the engine yourself would entail disassembling it, which would be arduous, time-consuming, and would need the services of a trained mechanic.

The better the engine operates for a longer period of time, the cleaner it is. The incorrect kind might cause engine harm.


Your motorbike is utilized in a variety of weather and terrain conditions. Make an investment in items that have a longer shelf life. Products of higher grade have a longer shelf life than those of lower quality.

Recommendations and Reviews

Locate your fellow Harley-Davidson drivers. If this is your first Harley, talk to a seasoned driver and ask what they favor on their bikes. Online reviews can also be a good source of recommendations.

Finding someone with the same bike as yours may also be more straightforward with a larger network, providing additional insight into how to care for your motor.


The cost of maintaining your motorcycle should be taken into account. If you spend a greater amount, your bike’s life and performance should increase.

You might want to look at multi-packaged items to save money. If you are certain that you can conduct the maintenance yourself, check for oil with changing kits.

FAQs : Frequently Asked Questions & Answers

1. How many gallons does a Harley-Davidson transmission require?

The amount of fluid required is determined by the fluid used. Some fluids are suitable for use in the engine, chaincase, and tranny. As a result, a quart of fluid should be plenty for the Harley.

2. When and how often should I change the transmission oil in my Harley?

An oil change should be performed every 5,000 miles, according to the owner’s handbook. The first oil change should be performed at 10,000 miles, and the transmission oil should be changed at 20,000 miles.

Every year, the gearbox should have its oil changed. When the oil is heated, it is simpler to remove the dirt and impurities.

The frequency is determined by how hard you ride and the distance traveled.

3. What type of transmission fluid should be used in a Harley-Davidson?

Harley-Davidson will certify your transmission fluid. In this manner, the motorcycle’s guarantee is not invalid. Your transmission oil must be able to withstand exceptionally high temperatures, pressure, and load.

4. Is synthetic oil preferable than regular oil?

You will need fewer oil changes if you use synthetic oil since you can ride your motorcycle for thousands of miles before needing one.

Furthermore, the viscosity of synthetic oil lubricates the gear teeth, preventing the friction that causes the noise.

Under addition, synthetic oil performs better in adverse weather situations. It also protects against overheating and maintains peak performance.

5. Is there ever a moment when synthetic oil should not be used?

You may use it whenever you want, whether you have new or old engines.

Last Words

We attempted to compile all of the information available about the best oil for Harley transmission. Knowing these things can help you make an informed decision about what to search for and purchase for your bike.

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