When it comes to choosing the right oil for your Harley transmission, there is often confusion and conflicting information. One common question that arises is whether it is safe to use 75W90 oil in a Harley transmission. In this article, we will explore the topic to provide you with a clear understanding of your options.
The Importance of Choosing the Right Oil
The transmission is a critical component of your Harley Davidson motorcycle. It transfers power from the engine to the wheels, ensuring smooth and efficient operation. To maintain optimal performance and longevity, it is crucial to use the right oil.
Using the wrong oil can lead to various issues such as increased friction, excessive wear, and even damage to the transmission. Therefore, it is essential to follow the manufacturer’s recommendations and select an oil that meets the specific requirements of your Harley transmission.
Understanding Oil Viscosity
Before we dive into the question of using 75W90 oil in a Harley transmission, let’s first understand what oil viscosity means. Viscosity refers to an oil’s resistance to flow. It determines how easily the oil can move through the engine or transmission components.
The Society of Automotive Engineers (SAE) classifies oils based on their viscosity rating, which is indicated by a number. The first number in the rating represents the oil’s viscosity in cold temperatures, while the second number represents its viscosity at operating temperatures.
For instance, in the case of 75W90 oil, the ’75’ indicates the oil’s viscosity in cold temperatures, while the ’90’ represents its viscosity at higher operating temperatures.
Harley Davidson typically recommends using 20W50 oil for their transmissions. This oil has a viscosity rating of 20 in cold temperatures and 50 at operating temperatures.
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Can You Use 75W90 in a Harley Transmission?
Technically speaking, 75W90 oil can be used in a Harley transmission. However, it is not the recommended or ideal choice. The higher viscosity of 75W90 oil can create additional drag and resistance, which may negatively impact the transmission’s performance.
Using 75W90 oil in your Harley transmission may result in harder shifting, increased friction, and potential damage to the gears and bearings. It may also void any warranty coverage on your transmission.
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Recommended Oils for Harley Transmissions
To ensure optimal performance and protection for your Harley transmission, it is best to stick to the manufacturer’s recommendations. Harley Davidson suggests using 20W50 oil for their transmissions, as it provides the necessary viscosity for smooth operation and efficient gear shifting.
There are several reputable oil brands that offer suitable options for Harley transmissions. These include:
- Red Line V-Twin Transmission Oil
- Bel-Ray Big Twin Transmission Oil
- Royal Purple Synchromax Manual Transmission Oil
- Amsoil Manual Transmission Oil
In Conclusion
While it is technically possible to use 75W90 oil in a Harley transmission, it is not recommended. Following the manufacturer’s guidelines and using the recommended 20W50 oil will ensure the best performance, longevity, and warranty coverage for your transmission.
It is always advisable to consult your Harley Davidson owner’s manual or speak with a certified mechanic for accurate and specific guidance regarding your motorcycle’s transmission needs.
Frequently Asked Questions On Can I Use 75w90 In My Harley Transmission
Can I Use Gear Oil In My Harley Transmission?
Yes, you can use gear oil in your Harley transmission. It is recommended to use a specific gear oil that is suitable for your Harley’s transmission. Gear oil provides the necessary lubrication and protection for the transmission components. Ensure you use the correct weight and type of gear oil recommended by your Harley’s manufacturer for optimal performance.
What Is The Best Oil To Put In A Harley-davidson Transmission?
The best oil to put in a Harley-Davidson transmission is the AMSOIL Synthetic V Twin Transmission Fluid. It offers superior protection and performance for your transmission. It is recommended to use this specific oil for optimal shifting effect. Avoid using gear oil in your Harley transmission.
What Weight Oil Goes In A Harley Transmission?
The recommended weight oil for a Harley transmission is 20W-50.
What Kind Of Oil Does A Harley 6 Speed Transmission Take?
The Harley 6-speed transmission requires specific oil for optimal performance. The recommended oil for a Harley 6-speed transmission is the Red Line V-Twin Transmission Oil, Bel-Ray Big Twin Transmission Oil, Royal Purple Synchromax Manual Transmission Oil, or Amsoil Manual Transmission Oil.
It is essential to use the right oil for smooth and reliable operation.
Can I Use 75w90 In My Harley Transmission?
No, it is not recommended to use 75W90 in your Harley transmission. Harley-Davidson recommends using specific transmission oils for optimal performance and protection. Using the correct oil will ensure smooth shifting and proper lubrication for your transmission.
