With an oil thread. Thinking of using Amsoil in Ryker. Severe gear 75w90 in final, severe gear 75w140 in trans., and not sure in motor. Amsoil has a 0w40 and a 10w40 but the book calls for 5w40 These are Synthetic oils from Amsoil. I’m not a dealer, but have used it in many of my motorcycles. cueman