there's bunches of folks on FJR forum that use rotella 5-40 in high revving inline 4's, got some for mine, have'nt put it in yet. yamaha spec's 20-40, just changed it to 20-50. just put amsoil 20-50 in both triumphs, cause triumph spec's 15-50, and it gets hot in ms. ain't no way i'm gonna give them idiots [dealers] 15$ a quart for mobile-1 altho i run it in my z-71, 4.00$ quart from wal-mart. why in the world does triumph price their dealers out of all the service work they could pick up if half-way reasonable???