I run 5w-40 valvoline extreme synthetic turbo diesel oil, I used to run 5w-40 delo 400 synthetic. Both are great oils, I changed over to the valvoline because of availability. I run 5w-40 for many reasons, I have a personal “fleet” of boats, motorcycles, excavator, mowers, trucks, ect.. while the 5w-40 I don’t use in the bikes it gets used in everything else because of the wide viscosity range provided from being synthetic.
About a decade ago I did run 15w-40 delo 400, never any issues with it, changed to synthetic because of needing the expanded viscosity range.
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