Gotta chime in with the "there is no BEST oil" camp.
There are too many variables. Manufacturers spec-and better- are what you want. "Better" here means takes even higher temps or is rated for longer oil change intervals.
I use Mobil1 0W-40 European Formula. They tell me it's a "true synthetic" (group IV) made from polyalphaolifin compounds not hydro-cracked petroleum (group III)
It met the requirements for turbocharged engines in the family. It's so uniformly praised I just rolled into using it in my non-turboed V70's.
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Our 3rd V70
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