Bringing this back from dead in leiu of starting another thread containing the same stuff....
So, I just finished doing a clutch on a DR650, helping a local pal... the clutch was assembled incorrectly years ago, which caused the failure... it wasn't an oil issue....
He picked up Castrol Power RS Racing 4T 10W-40, and filters as Advance Auto had a big sale... well, he somehow got this all for $35 for 5 quarts AND a filter...
This interested me, and surprisingly the dude dropped off 5 quarts and filter to me today... sweet.
Now, I know this was an old thread, and reading all the responses it was clear nobody chose to read up on this specific oil, at least it appears that way to me....
This oil is noted as and sold as FULL SYNTHETIC motorcycle oil.
It is noted to be excellent in wet clutch engines,
It exceeds API Service SL, and JASO MA-2 specifications...
I'm not seeing anything wrong here with this oil, its not raising a red flag for me.... as I have ALWAYS used Castrol dino oils in ALL my bikes and vehicals since 1973, and have never seen an issue with those engines, many were disassembled and reassembled, and all clean as could be, with never a failure, I have to ask again now that this oil has been out for a long time, anybody here experienced an issue?
Being a fully synthetic oil, it will be the first time I have "drunk the koolaide" so to speak, but expect it to perform well, and last as long, if not longer, than a conventional oil.... which I always run to 4k miles minimum, with a filter swap every change...
We'll see....