Spectro R.HDPG6 Heavy Duty Platinum Full Synthetic 6spd Trans Lube, 1 Quart Cures noisy six speed transmissions Smoother shifting, reduces fifth gear whine and eliminates clunks G4 technology, special additives that provide additional anti-wear protection, higher film strength between the gears, and reduces drag while extending gear life High loads and extreme heat do not affect the oil A.P.I. Gl-5 rated. Dyed Red. Exceeds all known OEM and Harley Davidson warranty requirements