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I’d recommend gear oil for the transmission instead of motor oil. I had a 01 dyna which I sold to a friend 8 years ago. After almost 80000 miles ,I’d say the amsoil severe gear 75-110 was a good choice for the 5 speed.

PG1 motorcycl oil is recommended for bikes that share a sump with the clutch and transmission. My 2012 Road King does not. I’m thinking that their High Performance Partial Synthetic 20-50 would be a better choice. Bike has an oil cooler and I have an aftermarket oil pan that increases capacity...