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. For example, a 2019 Harley-Davidson Street 750 model in Vivid Black with sale price of 7,599, 10 down payment. 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. What oil to use in Harley-Davidson primary drives Hi, I have been using your Mobil 1 MX4T ( Mobil 1 Racing 4T 10W-40 ) for 4 years and love it in my Japanese motorcycles. How Does 75W-140 Viscosity Compare To Other Transmission Oil Options? A thicker transmission fluid may actually make gear selection slightly more difficult. /rebates/2fproduct2f183162flucas-gear-oil&. 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. Parts: 1056 Lucas Synthetic 50 WT Transmission Oil is designed especially for. Wear protection– Using a 75W-140 will not improve gear wear protection. 47 L) low, oil temperature 160 F (70 C Harley-Davidson Genuine SYN. 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. The oil stabilizer I used last time and didnt this time for no particular reason. But, do consider that 75W-140 is much thicker than oils typically used in Harley transmissions. I run Lucas in all 3 holes as well and am a big fan. Our answer: It is perfectly acceptable to use 75W-140 gear oil in Harley-Davidson transmissions. Auto Cleaning Products, Degreaser and Carb CleanerĪ reader asks: Can I use 75W-140 gear oil in my 2007 Harley-Davidson Road Glide transmission? Some say that the heavier oil quiets down the transmission. Should be used in ALL air-cooled and water-cooled 4-stroke Engine, Primaries and Transmissions that call for SAE 20W-50 motor oil.Although competing motor oil companies initially paid no attention to NOACK results, the test has since become a critical measurement tool throughout the industry. Shock Therapy Suspension Fluid #5 Light (STL), #10 Medium (STM) AMSOIL was the first motor oil company in North America to use the NOACK volatility test to measure motor oil quality and performance.Synthetic Multi-Vehicle Power Steering Fluid (PSF).
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