What weight oil for 2010 harley Davidson custom 6 speed?

For a 2010 Harley-Davidson with a custom 6-speed transmission, the recommended oil weight is typically 20W-50 for the engine. This viscosity provides optimal protection and performance, especially in warmer climates. For the transmission, you can use a primary oil specifically designed for Harley-Davidson bikes, often a 75W-140 gear oil or a dedicated Transmission Fluid. Always consult your owner’s manual for the most accurate specifications.