I just want full synthetic oil in those cases.
HD 360 is fine as well as their Primary case oil. If I couldn't get Red Line stuff, then I would be using Spectro. Just my opinion based on hours and hours of reading user comments on this and othe V-Twin forums. I just want synthetic in the transmission.įWIW, I never even considered Syn 3 to be a contender and will not use it in my bike. I could easily tell when it was time to change it though. Spectro was fine, but noticably less gear noise and smoother shifting withthe Red Line. I just bought some Red Line Primary case oil and will try that in comparison to the Spectro. The Spectro has been dead smooth shifting/clutch engagement through its entire life cycle. With the HD primary oil, in very hot conditions, and near the end of its oil change cycle, clutch engagement was sometimes choppy and abrupt (again, a subjective observation). I'm trying Red Line V-Twin in the engine next just to compare to the Spectro. The HD-360 was fine as well but I want to run a synthetic (I'm just anal tha way). The Mobil 1 was fine and I have no complaints about it. It seems to run quietest with it (subjective, I know). My bike feels and runs best with the Spectro motor oil. My personal unscientific observations are: oil, and Red Line V-Twin transmission oil in the tranny. So far I've run HD 360, Spectro, and Mobil 1 V-Twin in the engine HD Primary Chaincase oil, and Spectro Primary case synthetic in the Primary and HD Primary case oil, Spectro 6 Speed Trans.
Well, I have 19,000 km on my 2010 RK Classic now (purchased new last year as carry over stock).
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