#What oil goes in a harley transmission free

Following the initial break-in period, the recommended 1000 mile service was performed and lubricants were replaced with Harley brand petrolium based lubricants.

#What oil goes in a harley transmission free

Also worth reading is the Great Oil Debate article written for American Iron magazine regarding synthetic oils.ДЇor my comparison I used a stock 2004 Heritage Twin Cam 88b with free breathing SE exhaust and K&N air cleaner. To read about wear test comparisons performed between ScreaminвЂ™ EagleВ® Synthetic (SYN3) and AMSOIL Synthetic Oil check out Amsoil vs. IвЂ™m not a chemist nor do I own a sophisticated test facility so my comparisons are based on personal observations and simple temperature readings. Performance is what counts so I set out to try several brands for myself to see if there really was a difference.

Rather than writing about the merits of synthetic oil being a superior product over petrolium based products, I thought IвЂ™d simply share my own experiences and let you decide. IвЂ™m not about to fuel the fire about the motor companies about-face on the use of synthetics, conflicting research reports, or all the mechanics who swear that вЂњonly Harley oil is formulated for Harley enginesвЂќ. WeвЂ™re not sure that the quieter operation is worth the hotter operating temps and (arguably) stiffer shifting.Synthetic oil for Harley-Davidson motorcycleвЂ™s is probably one of the most debated subjects you will find on any message board or in any Harley magazine. In conclusion, 75W-140 can certainly be used in Harley-Davidson transmissions. ThatвЂ™s why the 20W-50 motorcycle oilвЂ™s viscosity is so close to that of the the SAE 110 transmission fluid.ДЄlso 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 100вЊ. 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 performanceвЂ“ There is no shifting performance benefit to using a thicker fluid. Wear protection doesnвЂ™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 protectionвЂ“ 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. LetвЂ™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.

Auto Cleaning Products, Degreaser and Carb CleanerДЄ 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.

Shock Therapy Suspension Fluid #5 Light (STL), #10 Medium (STM).

Synthetic Multi-Vehicle Power Steering Fluid (PSF).