WMCOIOS 20W-50 in the engine and H-D Formula+ in the Transmission and Primary . . . (probably Mobil1 after my current inventory is exhausted). I change the engine oil every 2,000 miles and the Primary and Transmission Oil every 6 months on all my bikes. The FLSTC pictures is brandy new . . . so it gets/got all new fluids at 500 miles, 1,000 miles and at 2,000 miles total. FYI WMCOIOS is has to meet the MoCo API index standards.

 

Switching to Royal Purple soon, and will switch out my redline heavy Shockproof in the trans for RP trans oil just so I can get all my lube in one trip to the shop.