High mileage riders. Some advice needed

Known as Rotella T4 now...is dino. Used to be called Triple, not to be confused with T3. T6 Synthetic, T5 blend.
 
The regular non-synthetic Rotella has historically been 15w40 (Standard viscosity used for heavy-duty oil i.e. historical diesel engines), the synthetic or synthetic blends have historically been 5w40 or 0w40.
 
I go 10k on my oil before I change it. My car also. I have done an oil test & they said my oil is still good.
 
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