In order to keep your car running properly, it’s important to know which kind of transmission you have and what specific fluid it requires. There is also synthetic transmission fluid and specialty fluids used and specified in various types of transmissions including CVT and dual clutch models.
What viscosity is harley transmission oil manual#
In general, there are two main types of transmission fluid: automatic transmission fluid and manual transmission fluid. There are several different types and qualities of transmission fluid, and it’s best to reference your owner’s manual or a trusted auto technician when it comes to choosing the correct fluids for your vehicle. Automatic transmission fluid is a transmission oil that is used in automatic vehicles only, but in the case of a manual transmission where the clutch and shifter are used during gear shifts, manual transmission oil is used. While manual transmission oil or fluid has existed in some shape or form since the beginning of automobiles, automatic transmission fluid was created in the 1940s and has played an important role in cars ever since.Īutomatic transmission fluid is not the same as manual transmission fluid. Shifting gears is a strenuous task for a car, and transmission fluid is what allows a vehicle to shift with ease without wearing down its parts. Transmission fluid in both manual and automatic transmissions also helps to keep the transmission cool. In an automatic transmission, it not only lubricates the moving parts, but also provides hydraulic pressure and friction to make the internal parts work. Keep reading to learn all about transmission fluid, including what it does, the different types, when to change it and more.Īccording to AAMCO, UTI’s transmission provider and one of the most trusted and recognized automotive brands in the country, transmission fluid lubricates the bearings and metal parts inside a car’s manual gearbox and keeps them from grinding down as they move. While most people know about the importance of changing your engine oil, many don’t fully understand the role of transmission fluid and when to change it. From motor oil to radiator fluid to air conditioning refrigerant, it’s important to keep each of these fluids in check in order to keep your car in tip-top shape.Īmong these essential fluids is transmission fluid. We’re not sure that the quieter operation is worth the hotter operating temps and (arguably) stiffer shifting.There are many different fluids that run throughout a car. In conclusion, 75W-140 can certainly be used in Harley-Davidson transmissions. That’s why the 20W-50 motorcycle oil’s viscosity is so close to that of the the SAE 110 transmission fluid.Īlso note that the 75W-140 is a whopping 47% thicker than the commonly used 20W-50 and 31% thicker than the (SAE 110) V-Twin Transmission Fluid. Note that different scales are used to measure the viscosity of motor oils and gear oils. V-Twin Transmission (SAE 110)- 20.7 cST.The oil viscosity is measured in centistokes (cST) at 100☌. Here are the viscosity numbers for AMSOIL V-Twin 20W-50, V-Twin Synthetic Transmission Fluid and Severe Gear Synthetic 75W-140. How Does 75W-140 Viscosity Compare To Other Transmission Oil Options? A thicker transmission fluid may actually make gear selection slightly more difficult. Shifting performance– There is no shifting performance benefit to using a thicker fluid. Wear protection doesn’t necessarily improve by using a thicker oil. AMSOIL V-Twin Synthetic Transmission Oil or AMSOIL V-Twin 20W-50 Synthetic Motorcycle Oil can provide maximum transmission life. Wear protection– Using a 75W-140 will not improve gear wear protection. Hotter transmission operating temperatures would be the result. The downside to using a thicker oil is that it will hold more heat. The thicker fluid can dampen noises and rattles. The reason that some Harley owners use 75W-140 is that the transmission tends to run quieter. Let’s discuss the pros and cons of going with 75W-140. For instance, AMSOIL V-Twin Synthetic Transmission Oil is an SAE 110 gear oil. But, do consider that 75W-140 is much thicker than oils typically used in Harley transmissions.
Our answer: It is perfectly acceptable to use 75W-140 gear oil in Harley-Davidson transmissions.
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