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. Harley Davidson Part AMSOIL PRODUCT 99892-84 Transmission Lube SVT 75W-110 Gear Lube SVO 75W-140 Gear Lube MCS SAE 60 Engine Oil Am I missing something, or is this recommending SVT, SVO, (gear lube), MCS (Engine oil) in this priority Not trying to start an argument here, just trying to understand. 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.
Synthetic Multi-Vehicle Power Steering Fluid (PSF).