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I used Rotella T6 5w40 for nearly 50,000 miles in a Triumph Tiger 1050 with no issues, that bike never even needed the shims changed for the valve clearance.
I've got T6 in my RX3 right now and it's working fine. The 20w50 does seem to shift a tiny bit better but nothing huge. I'd use the 20w50 or what spud uses if your operating in the summer. For colder temps I'll stick with the Rotella.
I think it's far more important to change your oil regularly with a wet clutch then worry about what oil your using. Motorcycles are harder on oil than cars by far. I'm comfortable with my MG Stelvio's 6000 mile intervals because it's only for the engine, the transmission uses it's own oil.
My Tiger 1050 spec'd 5000 mile changes but oil analysis showed the oil was degraded by 3000, I just changed it at 2500 based on that.
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