20W50 works OK in the engine but is way too thin to be effective in the transmission and primary under cold and hot operating conditions. Like most things in life, the trade for this convenience is compromise. SYN 3 is convenient in that only one oil type need be used in the engine and drivetrain. SYN 3 is a 20W50 multi-use full synthetic oil that can be used in the transmission, primary, and the engine according to the Factory. Q: Do you recommend the new Harley SYN 3 oil?Ī: No. Although we recommend using Dexron III ATF with our King Kong Clutch due to the added friction modifiers found in the Automatic Transmission Fluid. Q: What kind of oil should I use in my primary?Ī: BAKER recommends Spectro Heavy Duty Primary Chaincase Fluid (85W) for all 1980-up stock clutches and mild performance aftermarket clutches. If Spectro cannot be found, use a gearbox grade oil or in a worst case scenario, differential (85W90) fluid. Q: What kind of oil should I use in my Transmission?Ī: BAKER recommends Spectro Heavy Duty Platinum 6 Speed Transmission Fluid (75W140) for all factory and BAKER 4, 5, 6 and 7-speed applications. The fluid level should be at the bottom of the derby cover opening. If you check the fluid level in the primary, do so with the bike held upright off of the jiffy stand.
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