Choosing The Best Transmission Oil For Harley 6 Speed

It’s essential to understand your motorcycle type to find the best transmission oil for Harley 6 Speed. The Harley Davidson speed 6 is a popular model of motorcycle that offers riders a unique experience on the open road.

While most people would think that using the transmission oil for Harley 5 speed would be just fine for a 6 speed, that might not always be the case. This bike is equipped with a 6-speed transmission, requiring a specific type of oil to keep it running smoothly.

If you’re looking for the best transmission oil for Harley 6 Speed, you’ll want to check out some of the products listed below.

best Transmission Oil For Harley 6 Speed

Why do you need the best transmission oil for Harley 6 Speed?

The Harley Davidson 6 Speed transmission is an excellent piece of machinery, and it deserves only the best in terms of lubrication. That’s why it’s essential to use the best transmission oil you can find when filling this bike’s tank.

Transmission oil is essential for protecting the transmission of your Harley. Transmission fluid cools, cleans, and lubricates vital internal components of the Harley Davidson 6 speed transmission, which might include gears, shafts, bearings, and piston rods.

Using poor-quality transmission oil can damage your Harley’s beautiful engine. This is a grave issue, as the Harley Davidson 6 speed transmission is a sensitive piece of equipment that holds up to six gears for smooth shifting and balancing during motion.

Since Harley Davidson transmissions are complex systems filled with high-tech equipment, they require premium transmission oil to run smoothly.

If you intend to ride your Harley for long distances and don’t want to damage the gears or other internal components of this finely tuned system, a good rule of thumb is to check your owner’s manual for what kind of oil your specific oil is Harley requires.

Keep in mind that different models may need slightly different oils, so always double-check before filling up at the gas station to ensure you’re always using the best transmission oil for Harley 6 speed!

How to pick the best transmission oil for Harley 6 Speed?

Harley 6 Speed

There are a few key factors to consider when finding the best transmission oil for Harley 6 Speed. The most crucial factor is that the oil must be able to handle the high temperatures that are produced by the motorcycle. The oil also needs to be able to provide good lubrication for the gears, and it should have a high viscosity so that it doesn’t leak.

The best transmission oil for Harley 6 speed must be able to handle high temperatures. When maintaining the best transmission oil for Harley 6 speed, you must check your bike’s manual or manufacturer’s website. This will provide you with a recommended weight and type of oil created specifically for your motorcycle model & year. You also need to check the Harley 6 speed transmission oil capacity to figure out how much of the oil you’d need.

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In addition to checking out your bike’s owner’s manual, here are a few other things to keep in mind when choosing the Best Transmission Oil For Harley Six-Speed :

Make and model

Ensure that you are using a recommended type of oil for your specific model and year. For example, if you have a 2012 Harley six-speed, check out all the 2013 oils because they may fit the bill. However, it’s essential to do your research still to be sure.


Harley transmission oil weight is usually 20W50 and 40W60. These numbers refer to the thickness or viscosity of the oil. Go with one of these weights so that you don’t have any problems with leaks or overheating.


Ultima 6 speed transmission oil should have a high flashpoint. Flashpoint refers to the temperature required to create enough vapor to ignite into flames once mixed with oxygen and an ignition source, such as a spark or flame. Best Transmission Oil For Harley Six-speed oils should be over 300° F (148° C), but typically fall around 350° F (177° C).


Transmission oil must provide good lubrication for gears. Best Transmission Oil For Harley Six-Speed should contain several additives such as anti-wear, extreme pressure, and corrosion inhibitors. These additives help protect against wear and tear on parts of the motorcycle that get hot, such as gears and bearings. Still, they also prevent rusting and corrosion from water and atmospheric elements—the best Transmission Oil For Harley Six Speed.

An oil with these protective features will last longer than a single-use Best Transmission Oil For Harley Six Speed.

Best transmission oil for Harley 6 speed

Motorcycle engines are lubricated by oil, and the type of oil you use will affect how well your bike runs. Transmission oil is a specialized type of motor oil that is designed to lubricate motorcycle transmissions. Unlike other types of motor oil, transmission oil has a higher viscosity, which means that it is thicker and resists flowing. This property helps to keep the gears in the transmission lubricated and prevents them from wearing down.

If your Harley Davidson has a 6-speed transmission, it is vital to use a high-quality transmission oil. Cheap oils can break down quickly and may not provide adequate protection for your transmission. Here is a list of the best transmission oil for Harley 6 speed.

Spectro Performance Oils R.HDPG6-6pk Heavy Duty Platinum


The Spectro Performance Oils R.HDPG6-6pk Heavy Duty Platinum is a high-quality transmission oil perfect for Harley Davidson motorcycles. This product is a synthetic transmission oil designed for Harley Davidson motorcycles. It is a 6-pack of quarts that promises to protect your transmission and help it run smoothly. 

The oil is also said to prolong the life of your motorcycle. Spectro’s Best Transmission Oil is made in the USA. It is rated either ISO VG 68 or Minus 40.

It offers superior protection and performance and comes with a host of advantages, including exceptional wear protection to protect the engine of your motorcycle, superior thermal stability to avoid any damages caused by overheating, enhanced oxidation resistance, outstanding corrosion protection to protect the interior of your vehicle from corrosion, and excellent slipperiness for maximum mobility of the parts.


  • It helps in keeping the engine clean
  • Protects gears and bearings
  • Perfect for long-distance rides
  • Smooth-shifting of gears
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  • Can be expensive

What are customers saying about Spectro Performance Oils R.HDPG6-6pk Heavy Duty Platinum?

According to the reviews, this product is amongst the most widely used by professionals and provides high-quality results, ensuring maximum performance and longevity for your transmissions.

Red Line 42804 V-Twin Transmission Oil with Shockproof


If you’re looking for the best transmission oil for Harley 6 speed, Red Line 42804 V-Twin Transmission Oil is a great option. It’s designed to provide superior protection for your motorcycle and comes with Shockproof technology to help keep your transmission running smoothly.

The oil is designed to help protect the transmission from damage and shock while providing optimal lubrication. It is available at most auto parts stores in New York and online. This product is known for providing superior wear protection and reducing heat. It contains a high level of anti-wear additives that protect gears and bearings, preventing slippage and wear in extreme conditions, and its compatibility with synthetic and mineral-based oils.


  • Easier gear shifting
  • Improves performance
  • It prevents wear and tear
  • Controls temperature


  • It comes in a weird color

What are customers saying about Red Line 42804 V-Twin Transmission Oil with Shockproof?

According to the reviews, this product works very effectively in quieting down the engine and removing the clunk. Additionally, the gear shifts a lot more efficiently and smoothly after use.

Maxima Racing Oils 90-119016C Chrome


If you want the best transmission oil for Harley 6 speed, look no further than the Maxima Racing Oils 90-119016C Chrome. This product is made from premium synthetic oils that have been formulated with potent additives that enhance its properties and ensure maximum performance levels. This oil comes in a chrome bottle to be a great addition to your Harley Davidson motorcycle!

There are quite a few additional features of the product as well that makes this product a premium choice. Such as its ability to reduce power loss due to friction by up to 20%, protection against rust, corrosion, and wear on high-performance motorcycles, maximum protection even in extreme conditions. It works great for any Harley Davidson 6 Speed motorcycle.


  • Works for engines in any condition
  • Has amazing formulation
  • Extends the life of your transmission
  • Cools down the engine


  • Can be expensive

What are customers saying about Maxima Racing Oils 90-119016C Chrome?

According to the reviews, this is among the best transmission oils with the Harley 6 Speed. Especially in the case of older models that require more help than the newer ones.

RAVENOL J1D2113 ATF (Automatic Transmission Fluid)


If you’re in the market for a new transmission oil for your Harley 6 speed, you can’t go wrong with Ravenol J1D2113 ATF. This oil is specifically designed for Harleys, and it provides excellent protection and performance. It’s also formulated to meet the latest standards to ensure that your bike runs at its best.

Ravenol J1D2113 ATF is an excellent choice if you want a high-performance, long-lasting automatic transmission fluid. It’s perfect for Harley motorcycles, and it comes with everything you need to change the oil on your Harley. This product is made in Germany, so it has superb quality control that ensures that every bottle meets the Ravenol standard of excellence.

This oil will give your bike superior performance under harsh conditions, and it provides some serious protection to keep your transmission running smoothly for many miles. Best of all, it’s backed up by a one-year warranty, so you can be sure that it works as advertised.

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  • Long-lasting
  • High-quality materials
  • Superior performance in harsh conditions
  • One year warranty


  • Designed specifically for Harley Davidson

What are customers saying about RAVENOL J1D2113 ATF (Automatic Transmission Fluid)?

The product has been exceptionally well received by the general public and has shown exceptional results when used with new and older models of the Harley Davidson.

Bel-Ray 96900-BT1 Big-Twin Transmission Oil


This transmission oil for Harley 6 speed is also known as Bel-Ray’ Stick Shell’ Transmission Lubricant. Made in the USA, the Bel-Ray 96900 Big-Twin Transmission Oil is a high-quality lubricant designed to protect Harley’s transmissions and other components in need of lubrication.

It features synthetic base fluids and extreme pressure additives to maximize lubricity and wear resistance while minimizing frictional losses.

The superior control offered by Best transmission oil for Harley 6 speed allows it to minimize clutch slippage and mitigate engine surge – making it an excellent choice for many motorcycles using six speeds or Harley Davidson transmissions that work in conjunction with their engines!

The Bel-Ray 96900 Big-Twin Transmission Oil is designed to meet or exceed Harley Davidson specifications, and it is recommended for use in all Harley transmissions. Looking for the best transmission oil for Harley 6 speed, look no further than this higher quality standard!

Bel-Ray 96900 Big-Twin Transmission Lubricant can be used alone or mixed with Belray Super Duty 90W 90WT Grease. It comes packaged in 1-quart bottles.


  • High viscosity to reduce breakage of gears
  • High-quality formulation
  • Mitigates engine surge
  • Avoids clutch slippage


  • Due to high viscosity, it can be challenging to use

What Are People Saying about Bel-Ray 96900-BT1 Big-Twin Transmission Oil?

According to the reviews around the internet, the product is best suitable for regions with a higher temperature. It has been known to perform exceptionally well under harsh conditions and preserve the life of your engines.

Frequently Asked Questions

Here are a few questions that you might have while looking for the best transmission oil for Harley 6 speed and their answer.

How many quarts would a Harley-Davidson transmission take?

A Harley-Davidson transmission typically takes 3.5 quarts of transmission oil. It’s essential to use high-quality oil to offer your bike maximum protection and performance. The oil is engineered to meet specific standards for superior performance, higher quality, and better safety.

When and how often do I change the transmission oil in my Harley-Davidson?

Harley-Davidson recommends that you change your transmission oil every 4,000 miles. You can find the recommended type of oil in your owner’s manual. If you do not have the manual, try to use the recommended one for Harley-Davidson motorcycles.

What kind of transmission fuel can be used in a Harley-Davidson?

Motorcycle lubricants are designed to protect your engine and transmission in various ways. It’s essential to understand each type of oil to choose the best transmission oil for Harley 6 speed for your needs. There are many different types of motorcycle oils on the market, so it can be overwhelming trying to decide which one is best for your bike. However, by understanding each type of oil, you can make an informed decision and keep your bike running smoothly.

Is synthetic oil preferable to conventional oil?

It is mainly down to personal preference. The two oils available, conventional and synthetic, are entirely different products. Therefore, they may perform differently in the engine and be considered the best transmission oil for Harley 6 speed.

With that said, there are indeed some advantages to choosing a synthetic product rather than a conventional one – these include better performance (better fuel economy), cleaner engines (less chance of clogging due to gumming up), and less resistance when under pressure (faster acceleration in wet weather).

Are there times that synthetic oil should not be used?

There are a few times when synthetic oil should not be used. One of those times is if you are using an engine that requires non-synthetic oil, such as a classic car or motorcycle. Another is if you live in a freezing climate, as the synthetic oil can thicken in the colder temperatures and not provide the lubrication your engine needs. You should also avoid using synthetic oil if you have an old car or motorcycle, as it may not be compatible with your engine.

Key Takeaways: Best transmission oil for harley 6 speed

Harley Davidson riders know that there is something special about how their bikes ride and sound. If you’re looking for the best transmission oil for Harley 6 speed, it’s crucial to find a product that will help keep your bike running in top condition. We’ve provided some information on different types of transmission oils and what to look for when making your purchase. Be sure to choose a quality product that meets your motorcycle’s needs!

By Jacob - The Rider

Hi, my name is Jacob. I'm the founder of Backyard Rider Mag - a blog about motorcycles. I've studied engineering in college but decided to make blogging my career because it really aligned with what I wanted to do creatively - talk about bikes! I've been riding for 16 years now- everything from sportbikes to cruisers, dirtbikes or even dual sports. And after all these years on the road, there are still new bikes that excite me just as much as when I first started riding.

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