I use Redline Vtwin shockproof synthetic transmission oil in my old 5 speed Evo's transmission. Valvoline Vr1 20w50 conventional in the engine and primary. I pull the clutch in and count to three, and it silently slips into first gear. It does clunk when going through the gears but so does my sons 2007 CVO 6 speed 110 Road King and my friends 2015 CVO 110 Rushmore Electraglide. My son and my friend use Harley's brand of recommended fluids in all three holes. I don't rag them about running Harley's oil and all 3 bikes run great. I pay more than double the price of the Harley oil for the qt of Redline in my transmission, but it is pink and it kinda looks like pink Kool Aid.