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The motorcycle performed so well and was so quiet I thought I had lost my hearing. After changing the primary & transmission with the Lucas products I went for a 360 mile ride with temperatures right around 97 degrees. I have tried all the Harley Davidson appropriate fluids (Formula +, Syn 3), Mobile 1 V-twin, Redline primary & transmission oils, Spectro for the six speed transmission, Bikers choice primary & transmission oils, and Drag Specialist primary & transmission oils.īy far the Lucas in the primary and transmission out performs the previous mentioned oils & lubes once again. I was so impressed that I went out and purchased your Lucas primary oil (10790) and the V twin gear oil (10791). The Lucas 20w50 synthetic is smoother, by far the quietest, cooler and the engines performance is awesome. For the record, AMSOIL recommends AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil in the engine, transmission and primary chaincase on most Harleys (consult. I tried your Lucas 50w petroleum and the V twin 50w synthetic both were better, however, your Lucas 20w50 synthetic (10702) is by far the best performing oil of all. Oil 20w50-60w, screaming eagle Syn 3 (screaming eagle synthetic blend), Valvoline 60w racing oil, Valvoline 20w50 motorcycle oil, Castrol RS V-twin ST synthetic 20w50 motorcycle oil, Redline synthetic 20w50-20w60, Amsoil 20w50-60w, Mobile 1 V-twin, Drag Specialist 25w60, and Torco V-series 60w. For some reason this engine 103 CC has ran hot and made a lot of valve train noise. Prior to testing, we instrumented the bike and rode it on the streets to determine the operating conditions that would most severely challenge the. We wanted to see how AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil held up in Harley’s newest engine. This is my sixth Harley Davidson since the early seventies. We bought a 2019 Harley Street Bob with a Milwaukee-Eight 107 engine for extreme-heat testing. Reason for that change was the shear stability was a little higher then Amsoil. I now use Redline Shockproof 240 gear oil in my transmission which looks like pepto bismal. I have 30,000 miles on my Harley Davidson FLHTCUTG and live in South Texas where the temperatures are warm all year around. Personally I use Amsoil MC 60wt Synthetic for my engine and primary oil and I did use Amsoil Severe Gear 75/140 gear oil in my transmission. I just wanted to let you know about my experience with your Lucas motorcycle products. Is a reduction of 40 degrees in the operating temperature of your Harley worth an investment of 11. JR Hall Says his Harley Davidson runs smoother, quieter, and cooler with Lucas 20w50 synthetic Motorcycle Oil And did you know you can also use the same 20W-50 that runs in your engine in the Primary and Transmission Another great benefit to using Amsoil in your Harley no need to ever add a oil cooler.