The inner primary, at the location of the compensating sprocket/crank/engine case, was 174*, but that’s the INNER primary, not the chrome outer case cover. I have purchased a '08 Harley and want to continue to use Mobil 1 motor oil but use 20W-50 in the engine. Now that I have to actually buy my own oil, I was wondering if there was something I should be using instead. Ive always used Harley brand 20W-50 (cause I worked at a dealer and it was cheap). The gun measured the temps on the primary at 98* in the rear over the cloutch basket and 103* towards the front, where the engine block/crank is. 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. Ive got a 77 74 CI Shovelhead, fairly recent rebuild (Id say no more than 4,000 miles ago), and solid lifters. Sometimes more frequent oil changes can be warranted. Harley-Davidson® recommends that your motorcycle receive servicing at least every five thousand miles, depending upon rider, riding style and conditions. When should I change my oil in my Harley? However, fully synthetic oil may be used for every 7,000 to 10,000 miles, as per Rips & Rides. The bike can be run up to 5,000 to 6,000 miles using Semi-synthetic oil. We recommend oil change of a quality Harley-Davidson after 2,500 miles, after the initial inspection of 1,000 miles. How many miles should I change Harley oil? We’re not sure that the quieter operation is worth the hotter operating temps and (arguably) stiffer shifting.According to numerous specs listed on the web, the SE 103 oil capacity is 4 qts. 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. 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.Shock Therapy Suspension Fluid #5 Light (STL), #10 Medium (STM).Synthetic Multi-Vehicle Power Steering Fluid (PSF).
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